IOS實現文字水平無間斷滾動

IOS實現文字水平無間斷滾動
IOS實現文字水平無間斷滾動

IOS跑馬燈效果，實現文字水平無間斷滾動，範例程式碼如下：

 

ViewController.h

#import @interface ViewController : UIViewController{    NSTimer           *timer;    UIScrollView      *scrollViewText;}@property (nonatomic ,strong) NSArray *arrData;@end

ViewController.m

#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         //計時器間隔時間(單位秒)#define K_MAIN_VIEW_SCROLLER_SPACE 20          //每次移動的距離#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH  280  //字型寬度#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20   //前後間隔距離@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//初始化資料-(void) initView{    if (!self.arrData) {        self.arrData = @[                          @{                              @newsId   :@201507070942261935,                              @newsImg  :@http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709395519.jpg,                              @newsTitle:@三大理由歐元任性抗跌，歐元區峰會將為希臘定調                          },                          @{                              @newsId    :@201507070929021220,                              @newsImg   :@http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709273545.jpg,                              @newsTitle :@歐盟峰會或現希臘轉機，黃金打響1162保衛戰                          },                          @{                              @newsId    :@201507070656471857,                              @newsImg   :@http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/2015070706533134.jpg,                              @newsTitle :@希臘困局歐元不怕，油價服軟暴跌8%                          }                      ];    }    //文字滾動    [self initScrollText];    //開啟滾動    [self startScroll];}//文字滾動初始化-(void) initScrollText{    //擷取捲軸    scrollViewText = (UIScrollView *)[self.view viewWithTag:K_MAIN_VIEW_SCROLL_TEXT_TAG];    if(!scrollViewText){        scrollViewText = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, K_MAIN_VIEW_SCROLL_HEIGHT)];        scrollViewText.showsHorizontalScrollIndicator = NO;   //隱藏水平捲軸        scrollViewText.showsVerticalScrollIndicator = NO;     //隱藏垂直捲軸        scrollViewText.tag = K_MAIN_VIEW_SCROLL_TEXT_TAG;        [scrollViewText setBackgroundColor:[UIColor grayColor]];        //清除子控制項        for (UIView *view in [scrollViewText subviews]) {            [view removeFromSuperview];        }        //添加到當前視圖        [self.view addSubview:scrollViewText];    }    if (self.arrData) {        CGFloat offsetX = 0 ,i = 0, h = 30;        //設定滾動文字        UILabel *labText = nil;        for (NSDictionary *dicTemp in self.arrData) {            labText = [[UILabel alloc] initWithFrame:CGRectMake(                                                                i * (K_MAIN_VIEW_SCROLLER_LABLE_WIDTH + K_MAIN_VIEW_SCROLLER_LABLE_MARGIN),                                                                (K_MAIN_VIEW_SCROLL_HEIGHT - h) / 2,                                                                K_MAIN_VIEW_SCROLLER_LABLE_WIDTH,                                                                h)];            [labText setFont:[UIFont systemFontOfSize:18]];            [labText setTextColor:[UIColor redColor]];            labText.text = dicTemp[@newsTitle];            offsetX += labText.frame.origin.x;            //添加到滾動視圖            [scrollViewText addSubview:labText];            i++;        }        //設定捲動區域大小        [scrollViewText setContentSize:CGSizeMake(offsetX, 0)];    }}//開始滾動-(void) startScroll{    if (!timer)        timer = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(setScrollText) userInfo:nil repeats:YES];    [timer fire];}//滾動處理-(void) setScrollText{    CGFloat startX = scrollViewText.contentSize.width - K_MAIN_VIEW_SCROLLER_LABLE_WIDTH - K_MAIN_VIEW_SCROLLER_LABLE_MARGIN;    [UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{        CGRect rect;        CGFloat offsetX = 0.0;        for (UILabel *lab in scrollViewText.subviews) {            rect = lab.frame;            offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE;            if (offsetX < -K_MAIN_VIEW_SCROLLER_LABLE_WIDTH)                offsetX = startX;            lab.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height);        }        NSLog(@offsetX:%f,offsetX);    }];}@end