Text horizontal scrolling in IOS

Text horizontal scrolling in IOS
Text horizontal scrolling in IOS

The IOS marquee achieves uninterrupted horizontal text scrolling. The sample code is as follows:

 

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 80366f # define K_MAIN_VIEW_SCROLL_TEXT_TAG 300 # define K_MAIN_VIEW_TEME_INTERVAL 0.35 // timer interval (in seconds) # define K_MAIN_VIEW_SCROLLER_SPACE 20 // the distance between each movement # define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH 280 // The font width # define Limit 20 // The distance between the frontend and backend @ interface ViewController () @ end @ implementation Ler # pragma mark-Class property @ synthesize arrData;-(void) viewDidLoad {[super viewDidLoad]; [self initView];}-(void) didreceivemorywarning {[super ready]; // Dispose of any resources that can be recreated .} # pragma mark-Custom method // initialize data-(void) initView {if (! Self. arrData) {self. arrData = @ [@ {@ newsId: @ 201507070942261935, @ newsImg: @ http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709395519.jpg, @ newsTitle: @ three reasons for euro resistance, Euro Zone summit will be set for Greece }, @ {@ newsId: @ 201507070929021220, @ newsImg: @ http://bg.fx678.com/HTMgr/upload/UpFiles/20150707/sy_2015070709273545.jpg, @ newsTitle: @ the EU Summit or the current turning point in Greece, gold 1162 Guard war}, @ {@ newsId: @ 201507070656471857, @ newsImg: @ http: // B Warning, @ newsTitle: @ the euro is not afraid of the Greek dilemma, and the oil price has plummeted by 8%}];} // text rolling [self initScrollText]; // enable rolling [self startScroll];} // initialize text scrolling-(void) initScrollText {// obtain the 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; // hide the horizontal scroll bar scrollViewText. showsVerticalScrollIndicator = NO; // hide the vertical scroll bar scrollViewText. tag = K_MAIN_VIEW_SCROLL_TEXT_TAG; [scrollViewText setBackgroundColor: [UIColor grayColor]; // clear the child Control for (UIView * view in [ScrollViewText subviews]) {[view removeFromSuperview];} // Add to current view [self. view addSubview: scrollViewText];} if (self. arrData) {CGFloat offsetX = 0, I = 0, h = 30; // set the scroll text UILabel * labText = nil; for (NSDictionary * dicTemp in self. arrData) {labText = [[UILabel alloc] initWithFrame: CGRectMake (I * (K_MAIN_VIEW_SCROLLER_LABLE_WIDTH + width), (K_MAIN_VIEW_SCROLL_HEIGH T-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; // Add to the scroll view [scrollViewText addSubview: labText]; I ++;} // set the scroll area size [scrollViewText setContentSize: CGSizeMake (offsetX, 0)];} // start rolling-(void) startScroll {if (! Timer) timer = [NSTimer scheduledTimerWithTimeInterval: K_MAIN_VIEW_TEME_INTERVAL target: self selector: @ selector (setScrollText) userInfo: nil repeats: YES]; [timer fire];} // scroll-(void) setScrollText {CGFloat startX = scrollViewText. contentSize. width-encryption-interval; [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