IOS跑马灯效果，实现文字水平无间断滚动

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            #import <UIKit/UIKit.h>
 2 3@interface ViewController : UIViewController{
 4     NSTimer           *timer;
 5     UIScrollView      *scrollViewText;
 6}
 7 8 @property (nonatomic ,strong) NSArray *arrData;
 91011@end

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              ViewController.m

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              跑马灯文字广告

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              Created by Time.X on 16/2/15.

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              Copyright ? 2016年 Time.X. All rights reserved.

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            #import
            "
            ViewController.h
            "
             10
             11
            #pragma mark - Class define variable
 12#define K_MAIN_VIEW_SCROLL_HEIGHT 80.0f
 13#define K_MAIN_VIEW_SCROLL_TEXT_TAG 300
 14#define K_MAIN_VIEW_TEME_INTERVAL 0.35         //计时器间隔时间(单位秒) 15#define K_MAIN_VIEW_SCROLLER_SPACE 20          //每次移动的距离 16#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH  280  //字体宽度 17#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20   //前后间隔距离 18 19@interface ViewController ()
 20 21@end 22 23@implementation ViewController
 24 25#pragma mark - Class property
 26@synthesize arrData;
 27 28 - (void)viewDidLoad {
 29    [super viewDidLoad];
 30 31    [self initView];
 32}
 33 34 - (void)didReceiveMemoryWarning {
 35    [super didReceiveMemoryWarning];
 36// Dispose of any resources that can be recreated. 37}
 38 39 40#pragma mark - Custom method
 41//初始化数据 42 -(void) initView{
 43 44if (!self.arrData) {
 45         self.arrData = @[
 46                         @{
 47@"newsId"   :@"201507070942261935",
 48@"newsImg"  :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709395519.jpg",
 49@"newsTitle" : @"三大理由欧元任性抗跌，欧元区峰会将为希腊定调" 50                                  },
 51                         @{
 52@"newsId"   :@201507070929021220,
 53@"newsImg"   :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709273545.jpg",
 54@"newsTitle" :@"欧盟峰会或现希腊转机，黄金打响1162保卫战" 55                              },
 56                         @{
 57@"newsId"    :@201507070656471857,
 58@"newsImg"   :@"http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/2015070706533134.jpg",
 59@"newsTitle" :@"希腊困局欧元不怕，油价服软暴跌8%" 60                              }
 61                         ];
 62    }
 63 64//文字滚动 65    [self initScrollText];
 66 67//开启滚动 68    [self startScroll];
 69}
 70 71 72//文字滚动初始化 73 -(void) initScrollText{
 74 75//获取滚动条 76     scrollViewText = (UIScrollView *)[self.view viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG];
 77if(!scrollViewText){
 78         scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, K_MAIN_VIEW_SCROLL_HEIGHT)];
 79         scrollViewText.showsHorizontalScrollIndicator = NO;   //隐藏水平滚动条 80         scrollViewText.showsVerticalScrollIndicator = NO;     //隐藏垂直滚动条 81         scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG;
 82        [scrollViewText setBackgroundColor:[UIColor grayColor]];
 83 84//清除子控件 85for (UIView *view in [scrollViewText subviews]) {
 86            [view removeFromSuperview];
 87        }
 88 89//添加到当前视图 90        [self.view addSubview:scrollViewText];
 91    }
 92 93 94if (self.arrData) {
 95 96         CGFloat offsetX = 0 ,i = 0, h = 30;
 97 98//设置滚动文字 99         UILabel *labText = nil;
100for (NSDictionary *dicTemp in self.arrData) {
101             labText = [[UILabel alloc] initWithFrame:CGRectMake(
102                                                                 i * (K_MAIN_VIEW_SCROLLER_LABLE_WIDTH + K_MAIN_VIEW_SCROLLER_LABLE_MARGIN),
103                                                                 (K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2,
104                                                                K_MAIN_VIEW_SCROLLER_LABLE_WIDTH,
105                                                                h)];
106             [labText setFont:[UIFont systemFontOfSize:18]];
107            [labText setTextColor:[UIColor whiteColor]];
108             labText.text = dicTemp[@"newsTitle"];
109             offsetX += labText.frame.origin.x;
110111//添加到滚动视图112            [scrollViewText addSubview:labText];
113114             i++;
115        }
116117//设置滚动区域大小118         [scrollViewText setContentSize:CGSizeMake(offsetX, 0)];
119    }
120}
121122123//开始滚动124 -(void) startScroll{
125126if (!timer)
127         timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES];
128129    [timer fire];
130}
131132133//滚动处理134 -(void) setScrollText{
135136     CGFloat startX = scrollViewText.contentSize.width - K_MAIN_VIEW_SCROLLER_LABLE_WIDTH - K_MAIN_VIEW_SCROLLER_LABLE_MARGIN;
137138     [UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{
139        CGRect rect;
140         CGFloat offsetX = 0.0;
141142for (UILabel *lab in scrollViewText.subviews) {
143144             rect = lab.frame;
145             offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE;
146if (offsetX < -K_MAIN_VIEW_SCROLLER_LABLE_WIDTH)
147                 offsetX = startX;
148149             lab.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height);
150        }
151152         NSLog(@"offsetX:%f",offsetX);
153154    }];
155156}
157158@end