我的animatewithduration，完成块只执行一次-Java 学习之路

我使用下面的代码块向下滑动UIView，完成后再旋转另一个UIView . 动画的第二部分，完成块仅执行一次，这意味着第一个动画未完成，否则它将到达完成块 . 在iPhone模拟器上，它看起来好像第一个动画完成了......任何人都可以帮我解决这个问题吗？我的NSLog说：

完成第1次开始第2完成第1完成第1完成第1 . . .

- (IBAction) move 
{ 
[UIView animateWithDuration:0.7 animations:^{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.7];
    [UIView setAnimationRepeatCount:1];
    [UIView setAnimationRepeatAutoreverses:NO];

    CGPoint pos = movingtTable.center;
    float moveDistance = 220.0;
    if(!isViewVisible){
        //expose the view
        pos.y = pos.y+moveDistance;
        //disable selection for xy table
        xTable.userInteractionEnabled = NO;
        yTable.userInteractionEnabled = NO;
        //angle = M_PI;
    }
    else
    {
        pos.y = pos.y-moveDistance;
        xTable.userInteractionEnabled = YES;
        yTable.userInteractionEnabled = YES;
        //angle = -M_PI;
    }
    isViewVisible = !isViewVisible;
    movingtTable.center = pos;      
    NSLog(@"finished 1st");


}completion:^(BOOL finished){
    NSLog(@"started 2nd");
        [UIView animateWithDuration:0.4 animations:^{
            //[UIView beginAnimations:nil context:NULL];
            [UIView setAnimationDuration:0.4];
            //[UIView setAnimationRepeatCount:1];
            //[UIView setAnimationRepeatAutoreverses:NO];
            arrows.transform = CGAffineTransformMakeRotation(angle); 
         }completion:^(BOOL finished){
             angle = -angle;
         }];
}];

2 回答

为什么要尝试在animateWithDuration块代码中初始化另一个UIView动画？将代码更新为以下内容，并确保一次不执行单个视图的多个动画 .

- (IBAction) move 
{ 
[UIView animateWithDuration:0.7 animations:^{
    CGPoint pos = movingtTable.center;
    float moveDistance = 220.0;
    if(!isViewVisible){
        //expose the view
        pos.y = pos.y+moveDistance;
        //disable selection for xy table
        xTable.userInteractionEnabled = NO;
        yTable.userInteractionEnabled = NO;
        //angle = M_PI;
    }
    else
    {
        pos.y = pos.y-moveDistance;
        xTable.userInteractionEnabled = YES;
        yTable.userInteractionEnabled = YES;
        //angle = -M_PI;
    }
    isViewVisible = !isViewVisible;
    movingtTable.center = pos;      
    NSLog(@"finished 1st");
}
completion:^(BOOL finished){
    NSLog(@"started 2nd");
        [UIView animateWithDuration:0.4 animations:^{
            arrows.transform = CGAffineTransformMakeRotation(angle); 
         }completion:^(BOOL finished){
             angle = -angle;
         }];
}];

BTW：如果你问我:)块代码需要一些严肃的重构

回复于 2024-04-25T05:08:12+08:00

你正在混合和匹配范式，我相信这会引起你所看到的问题 . 您正在创建一个动画块，但在该块内部，您正在创建一个新的动画例程，其中包含用于运行UIView动画的“旧”范例 . Apple正在引领人们远离旧范式，我也鼓励你们只使用块 .

这就是为什么完成块只运行一次，UIView animateWith块代码只运行一次 . 但是，您的内部动画代码会多次运行 .

取出：

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.7];
[UIView setAnimationRepeatCount:1];
[UIView setAnimationRepeatAutoreverses:NO];

如果您希望动画块运行多次，请使用完整方法：

animateWithDuration：delay：options：animations：completion：

使延迟= 0，并将您的选项设置为UIViewAnimationOptionRepeat，或者您需要的任何内容，以完成您希望块完成的周期数 .

这是我的建议，假设你想要重复：

- (IBAction) move 
{ 
[UIView animateWithDuration:0.7 
                      delay:0 
                    options:UIViewAnimationOptionRepeat 
                 animations:^{
                               CGPoint pos = movingtTable.center;
                               float moveDistance = 220.0;

                               if(!isViewVisible) {
                                 //expose the view
                                 pos.y = pos.y+moveDistance;
                                 //disable selection for xy table
                                 xTable.userInteractionEnabled = NO;
                                 yTable.userInteractionEnabled = NO;
                                 //angle = M_PI;
                               }
                               else {
                                 pos.y = pos.y-moveDistance;
                                 xTable.userInteractionEnabled = YES;
                                 yTable.userInteractionEnabled = YES;
                                 //angle = -M_PI;
                               }
                               isViewVisible = !isViewVisible;
                               movingtTable.center = pos;      
                               NSLog(@"finished 1st");
                             }
                completion:^(BOOL finished){
                               NSLog(@"started 2nd");
                               [UIView animateWithDuration:0.4 
                                                animations:^{
                                                               arrows.transform = CGAffineTransformMakeRotation(angle); 
                                                            }
                                                completion:^(BOOL finished){
                                                               angle = -angle;
                                                            }];
                             }];
}

回复于 2024-04-25T05:08:12+08:00

我的animatewithduration，完成块只执行一次

2 回答

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