奇怪的索引越界异常

Question

我想动画的视图内删除一个scrollView。 scrollView的子视图正在被一组对象填充。每个对象都有一个代表它的视图。有时当我删除时，我得到一个indexOutOfBounds异常。这是我的删除的代码：在这一点上[self.myObjects removeObjectAtIndex:viewToDelete.tag];

为删除从阵列的一个对象时发生一旦

-(void)deleteView:(UIView *)viewToDelete{ 
    [self.myObjects removeObjectAtIndex:viewToDelete.tag]; 
    [UIView animateWithDuration:0.5 animations:^{ 
     viewToDelete.alpha = 0.0; 
     for (NSInteger index = viewToDelete.tag+1; index<self.myViews.count; index++){ 
      UIView *view = [self.myViews objectAtIndex:index]; 
      view.center = CGPointMake(view.center.x,view.center.y-viewToDelete.frame.size.height); 
     } 
    }]; completion:^(BOOL finished) { 
     [view removeFromSuperview]; 
    }]; 

    [self.myViews removeObjectAtIndex:viewToDelete.tag]; 
    for (NSInteger index=0; index<self.myVies.count; index++){ 
     UIView *view = [self.myViews objectAtIndex:index]; 
     view.tag = index; 
    } 

} 

Answer 1

的问题是与动画块

你应该知道，动画块被异步处理，所以你的代码的最后和平可能会在动画制作过程中被调用，使一个烂摊子你迭代内循环动画块。你应该将

[self.myViews removeObjectAtIndex:viewToDelete.tag]; 
for (NSInteger index=0; index<self.myVies.count; index++){ 
    UIView *view = [self.myViews objectAtIndex:index]; 
    view.tag = index; 
} 

来完成块

Answer 2

错误

，项的总数将减少。所以你不能访问该索引处的对象。

你应该真的映射这两个数组self.myObjects和self.myViews。