Question

我有以下if语句，

if (CGRectIntersectsRect(car.frame, car2.frame) && (upMovement = -1 ) && (car2.hidden == NO)){
    [self bounce];
    [self carexplode];
    if (car2used == NO) {
        addedScore = 1;
        car2Used = YES;
    }
    car2.animationImages = [NSArray arrayWithObjects:
                                 [UIImage imageNamed:@"car2flames.png"], nil];
    [car2 setAnimationRepeatCount:0];
    car2.animationDuration = 20;
    [car2 startAnimating];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:4];
    [iceblock6 setAlpha:0];
    [UIView commitAnimations];
    car2.hidden = YES;

基本上，我希望它执行方法的顶部，如果一辆车撞到它，然后使用UIView动画^^，我希望它淡出，然后隐藏，这样我就可以将隐藏设置为否当它重新进入视图时（在它退出屏幕后重新加载到屏幕顶部）。但有了这个，它就会自动隐藏，没有4秒的淡出动画。我怎样才能解决这个问题？我已经尝试将car2.hidden放在if语句中，但我不知道该放入什么条件，因为UIView不是真正的bool或整数等等。有人有什么建议吗？

Answer 1

    [UIView animateWithDuration:1.0 delay:0.0 options:(UIViewAnimationOptions) animations:^{
        //place your animation here
        [iceblock6 setAlpha:0];
    } completion:^(BOOL finished) {
        //called when animation did finish. do what you want
        car2.hidden = YES;
    }];

其他方式：

{
...
if (CGRectIntersectsRect(car.frame, car2.frame) && (upMovement = -1 ) && (car2.hidden == NO)){
    [self bounce];
    [self carexplode];
    if (car2used == NO) {
        addedScore = 1;
        car2Used = YES;
    }
    car2.animationImages = [NSArray arrayWithObjects:
                                 [UIImage imageNamed:@"car2flames.png"], nil];
    [car2 setAnimationRepeatCount:0];
    car2.animationDuration = 20;
    [car2 startAnimating];

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:4.0];
    [iceblock6 setAlpha:0];
    [UIView commitAnimations];

    [self performSelector:@selector(hideCar2) withObject:self afterDelay:4.0];
}

-(void)hideCar2
{
    car2.hidden = YES;
}

淡出后如何隐藏物品（Objective-C）

1 个答案: