如何重複此動畫？

Question

我有一個UIImageView，當視圖加載時會移動。 它會先+100以上，然後設置BOOL完成。

當BOOL設置完成時，它會做另一個動畫，使UIImageView回到原來的位置。當我的UIImageView回到原來的位置時，它應該重新開始整個事情。這種重複應該永遠持續！我怎樣才能做到這一點？

這裏是我的代碼：

[UIView animateWithDuration:0.5 
    animations:^ 

    { 
     //move up 
     Person.center = CGPointMake(Person.center.x, Person.center.y +100); 

    } 
        completion:^(BOOL completed) 
    { 
     if (completed) 
     { 
      //completed move up..now move down 
      [UIView animateWithDuration:0.5 
           animations:^ 
       { 
        Person.center = CGPointMake(Person.center.x, Person.center.y -100); 
       } 

       ]; 
     } 
    }]; 

Answer 1

試試這個代碼...

-(void)repeatForever 
{ 
[UIView animateWithDuration:0.5 
       animations:^ 

{ 
    //move up 
    Person.center = CGPointMake(Person.center.x, Person.center.y +100); 

} 
       completion:^(BOOL completed) 
{ 
    if (completed) 
    { 
     //completed move up..now move down 
     [UIView animateWithDuration:0.5 animations:^{ 

      Person.center = CGPointMake(Person.center.x, Person.center.y -100); 

     } completion:^(BOOL finished) { 
      [self repeatForever]; 
     }]; 
    } 
}]; 

}