iOS中怎么实现文字水平无间断滚动效果
iOS中怎么实现文字水平无间断滚动效果，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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ViewController.h
#import
ViewController.m
//// ViewController.m// 滚动//#import "ViewController.h"#pragma mark - Class define variable#define K_MAIN_VIEW_SCROLL_HEIGHT 80.0f#define K_MAIN_VIEW_SCROLL_TEXT_TAG 300#define K_MAIN_VIEW_TEME_INTERVAL 0.35 //计时器间隔时间(单位秒)#define K_MAIN_VIEW_SCROLLER_SPACE 20.0f //每次移动的距离#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH 18.0f //单个字符宽度(与你设置的字体大小一致)#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20.0f //前后间隔距离#define K_MAIN_VIEW_SCROLLER_SLEEP_INTERVAL 1 //停留时间@interface ViewController ()@end@implementation ViewController#pragma mark - Class property@synthesize arrData;- (void)viewDidLoad { [super viewDidLoad]; [self initView];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}#pragma mark - Custom method//初始化数据-(void) initView{ if (!self.arrData) { self.arrData = @[ @{ @"newsId" :@"201507070942261935", @"newsImg" :@"/upload/otherpic53/44764.jpg", @"newsTitle":@"三大理由欧元任性抗跌，欧元区峰会将为希腊定调" }, @{ @"newsId" :@"201507070929021220", @"newsImg" :@"/upload/otherpic53/44765.jpg", @"newsTitle" :@"欧盟峰会或现希腊转机，黄金打响1162保卫战" }, @{ @"newsId" :@"201507070656471857", @"newsImg" :@"/upload/otherpic53/44766.jpg", @"newsTitle" :@"希腊困局欧元不怕，油价服软暴跌8%" } ]; } //文字滚动 [self initScrollText]; //开启滚动 [self startScroll];}//文字滚动初始化-(void) initScrollText{ //获取滚动条 scrollViewText = (UIScrollView *)[self.view viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG]; if(!scrollViewText){ scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 80, self.view.frame.size.width, K_MAIN_VIEW_SCROLL_HEIGHT)]; scrollViewText.showsHorizontalScrollIndicator = NO; //隐藏水平滚动条 scrollViewText.showsVerticalScrollIndicator = NO; //隐藏垂直滚动条 scrollViewText.scrollEnabled = NO; //禁用手动滑动 //横竖屏自适应 scrollViewText.autoresizingMask = UIViewAutoresizingFlexibleWidth; scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG; [scrollViewText setBackgroundColor:[UIColor grayColor]]; //给滚动视图添加事件 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scrollerViewClick:)]; [scrollViewText addGestureRecognizer:tapGesture]; //添加到当前视图 [self.view addSubview:scrollViewText]; }else{ //清除子控件 for (UIView *view in [scrollViewText subviews]) { [view removeFromSuperview]; } } if (self.arrData) { CGFloat offsetX = 0 ,i = 0, h = 30; //设置滚动文字 UIButton *btnText = nil; NSString *strTitle = [[NSString alloc] init]; for (NSDictionary *dicTemp in self.arrData) { strTitle = dicTemp[@"newsTitle"]; btnText = [UIButton buttonWithType:UIButtonTypeCustom]; [btnText setFrame:CGRectMake([self getTitleLeft:i], (K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2, strTitle.length * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH, h)]; [btnText setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; [btnText setTitle:strTitle forState:UIControlStateNormal]; //横竖屏自适应 btnText.autoresizingMask = UIViewAutoresizingFlexibleWidth; offsetX += btnText.frame.origin.x; //设置为 NO,否则无法响应点击事件 btnText.userInteractionEnabled = NO; //添加到滚动视图 [scrollViewText addSubview:btnText]; i++; } //设置滚动区域大小 [scrollViewText setContentSize:CGSizeMake(offsetX, 0)]; }}#pragma mark - 滚动处理//开始滚动-(void) startScroll{ if (!timer) timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES]; [timer fire];}//滚动处理-(void) setScrollText{ [UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{ CGRect rect; CGFloat offsetX = 0.0,width = 0.0; for (UIButton *btnText in scrollViewText.subviews) { rect = btnText.frame; offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE; width = [btnText.titleLabel.text length] * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH; btnText.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height); NSLog(@"offsetX:%f",offsetX); } if (offsetX < -width){ [UIView setAnimationsEnabled:NO]; [self initScrollText]; }else [UIView setAnimationsEnabled:YES]; }];}#pragma mark - 动态获取左边位置-(float) getTitleLeft:(CGFloat) i { float left = i * K_MAIN_VIEW_SCROLLER_LABLE_MARGIN; if (i > 0) { for (int j = 0; j < i; j ++) { left += [[self.arrData objectAtIndex:j][@"newsTitle"] length] * K_MAIN_VIEW_SCROLLER_LABLE_WIDTH; } } return left;}#pragma mark - 新闻点击事件-(void)btnNewsClick:(UIButton *) sender{ NSString *strNewsTitle = sender.titleLabel.text; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"系统提示" message:strNewsTitle delegate:sender cancelButtonTitle:@"确定" otherButtonTitles:@"其他", nil]; [alert show];}-(void)scrollerViewClick:(UITapGestureRecognizer*)gesture{ CGPoint touchPoint = [gesture locationInView:scrollViewText]; for (UIButton *btn in scrollViewText.subviews) { if ([btn.layer.presentationLayer hitTest:touchPoint]) { [self btnNewsClick:btn]; break; } }}@end
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