iOS 跑馬燈捲軸效果程式碼

跑馬燈效果的捲軸，一般出現在ios應用的底部。用於顯示動態變化的資訊或內容較長的資訊，在個類應用中使用廣泛
以下兩種可用的跑馬燈滾動MarqueeBar的實現。

1.直接在ViewController中實現對UIView的位置定時移動來實現，以下代碼直接加入到ViewController中，在viewWillAppear中調用loadView即可。

 

代碼如下

複製代碼

- (void)marqueeView {       CGRect frame = self.vMarqueeContainer.frame;     frame.origin.x = frame.origin.x -2;     if(frame.origin.x < -frame.size.width )     {         frame.origin.x  = 320;     }     self.vMarqueeContainer.frame = frame;       //延時遞迴調用     [self performSelector:@selector(marqueeView) withObject:nil afterDelay:0.04]; }   - (void)loadView {  //marqueenbar背景，位置高度等控制     UIView *viewMarqueeBar = [[[UIView alloc]initWithFrame:CGRectMake(0, 347, 320, 20)]autorelease];     [viewMarqueeBar setBackgroundColor:[UIColor darkGrayColor]];       //滾動容器，顯示滾動範圍     UIView *viewMarqueeContainer = [[[UIView alloc]initWithFrame:CGRectMake(320, 3, 360, 14)]autorelease];     [viewMarqueeContainer setBackgroundColor:[UIColor clearColor]];     [viewMarqueeContainer setClipsToBounds:YES];     [viewMarqueeContainer setOpaque:YES];       //內容     UILabel *lblContent = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 50,14)]autorelease];     [lblContent setText:@"這裡是捲軸。。。。。"];     [lblContent setTextColor:[UIColor whiteColor]];     [lblContent setBackgroundColor:[UIColor clearColor]];     [lblContent setFont:[UIFont fontWithName:@"Helvetica" size:12]];     [lblContent setOpaque:YES];       self.view= viewMarqueeBar;     self.vMarqueeContainer = viewMarqueeContainer;       [self.view addSubview:viewMarqueeContainer];       [self marqueeView]; }

2.自行定義捲軸控制項，讓view自己滾動起來，通過不斷的相互方法調用實現迴圈滾動
UIMarqueeBarView.h定義

代碼如下

複製代碼

/**  *UIMarqueeBarView.h  */ @interface UIMarqueeBarView : UIView { }   - (void)start; - (void)stop; @end UIMarqueeBarView.m實現 /**  *UIMarqueeBarView.m  */   #import "UIMarqueeBarView.h"   @implementation UIMarqueeBarView   - (void)dealloc {     [super dealloc]; }   - (id)initWithFrame:(CGRect)frame {     self = [super initWithFrame:frame];     if (self) {         // Initialization code   [self setupView];     }     return self; }   -(id)initWithCoder:(NSCoder *)aDecoder {  if( (self = [super initWithCoder:aDecoder]) ) {   // Initialization code   [self setupView];  }  return self; }   - (void)setupView {     [self setBackgroundColor:[UIColor lightGrayColor]];     [self setClipsToBounds:YES];     [self setOpaque:YES];       UILabel *lblContent = [[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 150 ,16)]autorelease];     [lblContent setText:@"這裡是捲軸。。。。。"];     [lblContent setTextColor:[UIColor whiteColor]];     [lblContent setBackgroundColor:[UIColor clearColor]];     [lblContent setFont:[UIFont fontWithName:@"Helvetica" size:14]];     [lblContent setNumberOfLines:1];     [lblContent setOpaque:YES];       [self addSubview:lblContent]; }   - (void)start {     if (self.viewContainer == NULL) {         [self setupView];     }       [self startAnimation]; } - (void)stop {   }   -(void)startAnimation {     [UIView beginAnimations:@"MarqueeBarAniamation" context:nil];     [UIView setAnimationCurve:UIViewAnimationCurveLinear];     [UIView setAnimationDuration:25];     [UIView setAnimationDelegate:self];     [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];       CGRect viewFrame = self.viewContainer.frame;     viewFrame.origin.x = -320;     [self.viewContainer setFrame:viewFrame];       [UIView commitAnimations]; }   -(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {      CGRect viewFrame = self.viewContainer.frame;     viewFrame.origin.x = 320;     [self.viewContainer setFrame:viewFrame];  [self startAnimation]; }