跟視圖設置

self.backVIew.clipsToBounds = YES;

建立定時器

[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(labelRoll) userInfo:nil repeats:YES];

跑起來

- (void) labelRoll

{
  
  CGPoint labelCenter = self.label.center;

  // 當控件的x坐標已經(jīng)超過了視圖的寬度

  if(labelCenter.x  <  self.backVIew.frame.origin.x-self.label.frame.size.width){

  // 控制控件自視圖右側開始移動

  self.customLab.center = CGPointMake(self.backVIew.frame.size.width+self.label.frame.size.width/2, labelCenter.y);

  }else{

  // 控制控件移動中(微調(diào))

  self.label.customLab.center = CGPointMake(labelCenter.x-5, labelCenter.y);
  }

}