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add Demo.
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‎TXScrollLabelView/TXScrollLabelView.h‎

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//
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// TXScrollLabelView.h
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//
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// Created by tingxins on 2/23/16.
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// Copyright © 2016 tingxins. All rights reserved.
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// 滚动视图
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typedef enum {
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TXScrollLabelViewType_LR,
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TXScrollLabelViewType_UD,
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TXScrollLabelViewType_Flip,
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TXScrollLabelViewType_FlipNoCle
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}TXScrollLabelViewType;
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#import <UIKit/UIKit.h>
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@interface TXScrollLabelView : UIScrollView
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#pragma mark - Property
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/** 滚动文字 */
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@property (copy, nonatomic) NSString *scrollTitle;
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/** 滚动类型 */
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@property (assign, nonatomic) TXScrollLabelViewType scrollType;
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/** 滚动速率 */
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@property (assign, nonatomic) NSTimeInterval scrollVelocity;
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#pragma mark - Methods
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/**
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* 开始滚动
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*/
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- (void) beginScrolling;
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/**
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* 停止滚动
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*/
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- (void) stopScrolling;
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/**
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* 暂停滚动
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*/
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- (void) pauseScrolling;
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@end

‎TXScrollLabelView/TXScrollLabelView.m‎

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//
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// TXScrollLabelView.m
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//
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// Created by tingxins on 2/23/16.
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// Copyright © 2016 tingxins. All rights reserved.
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//
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#define TXScrollLabelFont [UIFont systemFontOfSize:14]
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#import "TXScrollLabelView.h"
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#import "UIView+TXFrame.h"
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#import <CoreText/CoreText.h>
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@interface TXScrollLabelView ()
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@property (weak, nonatomic) UILabel *scrollLabel0;
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@property (weak, nonatomic) UILabel *scrollLabel1;
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@property (weak, nonatomic) UITextView *scrollTextView;
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@property (strong, nonatomic) NSTimer *scrollTimer;
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@property (strong, nonatomic) NSArray *scrollArray;
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@end
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@implementation TXScrollLabelView
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- (NSArray *)scrollArray {
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if (_scrollArray) return _scrollArray;
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return _scrollArray = [self getSeparatedLinesFromLabel];
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}
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- (instancetype)initWithFrame:(CGRect)frame {
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if (self = [super initWithFrame:frame]) {
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self.backgroundColor = [UIColor blackColor];
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UILabel *scrollLabel0 = [[UILabel alloc]init];
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scrollLabel0.numberOfLines = 0;
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self.scrollLabel0 = scrollLabel0;
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self.scrollLabel0.font = TXScrollLabelFont;
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self.scrollLabel0.textColor = [UIColor whiteColor];
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[self addSubview:scrollLabel0];
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UILabel *scrollLabel1 = [[UILabel alloc]init];
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scrollLabel1.numberOfLines = 0;
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self.scrollLabel1 = scrollLabel1;
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self.scrollLabel1.font = TXScrollLabelFont;
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self.scrollLabel1.textColor = [UIColor whiteColor];
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[self addSubview:scrollLabel1];
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scrollLabel0.lineBreakMode = NSLineBreakByWordWrapping;
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scrollLabel1.lineBreakMode = NSLineBreakByWordWrapping;
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scrollLabel0.textAlignment = NSTextAlignmentCenter;
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scrollLabel1.textAlignment = NSTextAlignmentCenter;
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self.scrollEnabled = NO;
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}
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return self;
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}
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- (void)setScrollTitle:(NSString *)scrollTitle {
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_scrollTitle = [scrollTitle copy];
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switch (self.scrollType) {
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case TXScrollLabelViewType_LR:
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{
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CGSize scrollLabelS = [self.scrollTitle boundingRectWithSize:CGSizeMake(0, 30) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: TXScrollLabelFont} context:nil].size;
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self.scrollLabel0.frame = CGRectMake(10, 0, scrollLabelS.width, 30);
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self.scrollLabel0.text = self.scrollTitle;
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self.scrollLabel1.frame = CGRectMake(CGRectGetMaxX(self.scrollLabel0.frame) + 20, 0, scrollLabelS.width, 30);
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self.scrollLabel1.text = self.scrollTitle;
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self.contentSize = CGSizeMake(scrollLabelS.width * 2 + 40, scrollLabelS.height);
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CGFloat maxWidth = 200;
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self.bounds = CGRectMake(0, 0, MIN(maxWidth, scrollLabelS.width), 30);
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}
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break;
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case TXScrollLabelViewType_UD:
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{
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CGSize scrollLabelS = [self.scrollTitle boundingRectWithSize:CGSizeMake(200, 0) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: TXScrollLabelFont} context:nil].size;
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self.scrollLabel0.frame = CGRectMake(0, 0, scrollLabelS.width, scrollLabelS.height);
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self.scrollLabel0.text = self.scrollTitle;
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self.scrollLabel1.frame = CGRectMake(0, CGRectGetMaxY(self.scrollLabel0.frame), scrollLabelS.width, scrollLabelS.height);
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self.scrollLabel1.text = self.scrollTitle;
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self.contentSize = CGSizeMake(scrollLabelS.width, scrollLabelS.height * 2);
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self.bounds = CGRectMake(0, 0, scrollLabelS.width, 30);
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}
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break;
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case TXScrollLabelViewType_Flip:
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{
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CGSize scrollLabelS = [self.scrollTitle boundingRectWithSize:CGSizeMake(200, 30) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: TXScrollLabelFont} context:nil].size;
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self.scrollLabel0.frame = CGRectMake(0, 0, scrollLabelS.width, 30);
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self.scrollLabel0.text = self.scrollTitle;
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self.scrollLabel1.frame = CGRectMake(0, CGRectGetMaxY(self.scrollLabel0.frame), scrollLabelS.width, 30);;
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self.scrollLabel1.text = self.scrollTitle;
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self.contentSize = CGSizeMake(scrollLabelS.width, scrollLabelS.height * 2);
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self.bounds = CGRectMake(0, 0, scrollLabelS.width, 30);
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}
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break;
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case TXScrollLabelViewType_FlipNoCle:
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{
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NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc]init];
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paraStyle.lineSpacing = 10;
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NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:_scrollTitle];
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[attributedStr addAttributes:@{NSFontAttributeName:TXScrollLabelFont, NSParagraphStyleAttributeName:paraStyle} range:NSMakeRange(0, attributedStr.length)];
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CGSize scrollLabelS = [attributedStr boundingRectWithSize:CGSizeMake(self.tx_width, 0) options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;
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self.scrollLabel0.frame = CGRectMake(0, 0, scrollLabelS.width, self.tx_height);
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self.scrollLabel1.frame = CGRectMake(0, CGRectGetMaxY(self.scrollLabel0.frame), scrollLabelS.width, self.tx_height);
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CGFloat width = scrollLabelS.width;
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if (!self.tx_width) {
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self.tx_width = width;
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}
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self.contentSize = CGSizeMake(self.tx_width, scrollLabelS.height * 2);
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self.bounds = CGRectMake(0, 0, self.tx_width, self.tx_height);
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}
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break;
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default:
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break;
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}
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}
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- (void)beginScrolling {
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[self stopScrolling];
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self.scrollTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateScrolling) userInfo:nil repeats:YES];
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[[NSRunLoop mainRunLoop] addTimer:self.scrollTimer forMode:NSRunLoopCommonModes];
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}
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- (void)stopScrolling {
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[self.scrollTimer invalidate];
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self.scrollTimer = nil;
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}
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- (void)pauseScrolling {
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[self.scrollTimer invalidate];
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self.scrollTimer = nil;
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}
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- (void)updateScrolling {
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switch (self.scrollType) {
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case TXScrollLabelViewType_LR:
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{
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if (self.contentSize.width * 0.5 == self.contentOffset.x || self.contentOffset.x > self.contentSize.width * 0.5) {
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[self stopScrolling];
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self.contentOffset = CGPointMake(2, 0);//x增加偏移量，防止卡顿
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[self beginScrolling];
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return;
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}
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self.contentOffset = CGPointMake(self.contentOffset.x + 1, self.contentOffset.y);
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}
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break;
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case TXScrollLabelViewType_UD:
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{
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if (self.contentOffset.y > self.scrollLabel0.frame.size.height) {
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[self stopScrolling];
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self.contentOffset = CGPointMake(0, 2);//y增加偏移量，防止卡顿
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[self beginScrolling];
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return;
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}
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self.contentOffset = CGPointMake(self.contentOffset.x, self.contentOffset.y + 1);
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}
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break;
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case TXScrollLabelViewType_Flip:
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{
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[self stopScrolling];
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self.scrollTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(updateScrolling) userInfo:nil repeats:YES];
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[[NSRunLoop mainRunLoop] addTimer:self.scrollTimer forMode:NSRunLoopCommonModes];
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[self flipAnimationWithDelay:0];
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}
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break;
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case TXScrollLabelViewType_FlipNoCle:
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{
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[self stopScrolling];
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NSTimeInterval velocity = self.scrollVelocity ? self.scrollVelocity : 2;
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self.scrollTimer = [NSTimer scheduledTimerWithTimeInterval:velocity target:self selector:@selector(updateScrolling) userInfo:nil repeats:YES];
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[[NSRunLoop mainRunLoop] addTimer:self.scrollTimer forMode:NSRunLoopCommonModes];
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[self flipNoCleAnimationWithDelay:velocity];
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}
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break;
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default:
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break;
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}
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}
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- (void)flipAnimationWithDelay:(NSTimeInterval)delay {
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[UIView transitionWithView:self.scrollLabel0 duration:delay * 0.5 options:UIViewAnimationOptionTransitionFlipFromTop animations:^{
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self.scrollLabel0.tx_bottom = 0;
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[UIView transitionWithView:self.scrollLabel0 duration:delay * 0.5 options:UIViewAnimationOptionTransitionFlipFromTop animations:^{
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self.scrollLabel1.tx_y = 0;
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} completion:^(BOOL finished) {
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self.scrollLabel0.tx_y = self.tx_height;
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UILabel *tempLabel = self.scrollLabel0;
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self.scrollLabel0 = self.scrollLabel1;
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self.scrollLabel1 = tempLabel;
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}];
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} completion:nil];
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}
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- (void)flipNoCleAnimationWithDelay:(NSTimeInterval)delay {
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static int count = 0;
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self.scrollLabel0.text = self.scrollArray[count];
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count ++;
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if (count == self.scrollArray.count) count = 0;
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self.scrollLabel1.text = self.scrollArray[count];
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[self flipAnimationWithDelay:delay];
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}
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#pragma mark - 文字分行
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-(NSArray *)getSeparatedLinesFromLabel {
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NSString *text = _scrollTitle;
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UIFont *font = [UIFont systemFontOfSize:15];
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CTFontRef myFont = CTFontCreateWithName((__bridge CFStringRef)([font fontName]), [font pointSize], NULL);
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NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:text];
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[attStr addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)myFont range:NSMakeRange(0, attStr.length)];
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CTFramesetterRef frameSetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attStr);
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CGMutablePathRef path = CGPathCreateMutable();
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CGPathAddRect(path, NULL, CGRectMake(0,0,self.tx_width,100000));
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CTFrameRef frame = CTFramesetterCreateFrame(frameSetter, CFRangeMake(0, 0), path, NULL);
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NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
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NSMutableArray *linesArray = [[NSMutableArray alloc]init];
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for (id line in lines) {
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CTLineRef lineRef = (__bridge CTLineRef )line;
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CFRange lineRange = CTLineGetStringRange(lineRef);
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NSRange range = NSMakeRange(lineRange.location, lineRange.length);
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NSString *lineString = [text substringWithRange:range];
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[linesArray addObject:lineString];
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}
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return (NSArray *)linesArray;
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}
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@end

‎TXScrollLabelView/UIView+TXFrame.h‎

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//
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// UIView+TXFrame.h
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// TXSwipeTableViewTest
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//
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// Created by tingxins on 9/1/16.
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// Copyright © 2016 tingxins. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@interface UIView (TXFrame)
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/** 设置x值 */
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@property (assign, nonatomic) CGFloat tx_x;
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/** 设置y值 */
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@property (assign, nonatomic) CGFloat tx_y;
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/** 设置width */
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@property (assign, nonatomic) CGFloat tx_width;
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/** 设置height */
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@property (assign, nonatomic) CGFloat tx_height;
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/** 设置size */
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@property (assign, nonatomic) CGSize tx_size;
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/** 设置origin */
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@property (assign, nonatomic) CGPoint tx_origin;
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/** 设置center */
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@property (assign, nonatomic) CGPoint tx_center;
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/** 设置center.x */
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@property (assign, nonatomic) CGFloat tx_centerX;
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/** 设置center.y */
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@property (assign, nonatomic) CGFloat tx_centerY;
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/** 设置bottom */
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@property (assign, nonatomic) CGFloat tx_bottom;
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@end

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