动画中的子视图幻灯片，iphone

Question

我有一个包含两个 UIButtons 的 UIview。

-(void)ViewDidLoad
{
    geopointView = [[UIView alloc] initWithFrame:CGRectMake(0, 350, 120, 80)];
    geopointView.backgroundColor = [UIColor greenColor]; 

    UIButton *showGeoPointButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain];
    showGeoPointButton.frame = CGRectMake(0, 0, 120, 40);
    showGeoPointButton.titleLabel.font = [UIFont systemFontOfSize:13.0];
    [showGeoPointButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[showGeoPointButton addTarget:self action:@selector(showPlaces:) forControlEvents:UIControlEventTouchUpInside];

    UIButton *SaveButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect] retain] 
    SaveButton.frame = CGRectMake(0, 40, 120, 40);
    SaveButton.titleLabel.font = [UIFont systemFontOfSize: 15.0];
    [SaveButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [SaveButton addTarget:self action:@selector(savePlacePopUp) forControlEvents:UIControlEventTouchUpInside];

    [geopointView addSubview:showGeoPointButton];
    [geopointView addSubview:SaveButton];
}

我想在调用以下方法时为 UIview 的滑入添加动画效果。

-(void) showAnimation

我试图通过以下方式做到这一点，但我看不到动画。我该怎么做呢？

-(void) showAnimation{
    [UIView animateWithDuration:10.0 animations:^{
        [self.view addSubview:geopointView];
    }];
}

感谢您提前提供的任何帮助。

Answer 1

您需要添加带有帧值的子视图，该帧值是您希望动画开始的位置（屏幕外？），然后更改动画块内的帧值。帧会随着持续时间而变化，导致出现运动。该视图必须已经是一个子视图 - 我不相信添加子视图可以设置动画，这没有任何意义。

-(void)showAnimation {

    [self.view addSubview:geopointView]
    geopointView.frame = // somewhere offscreen, in the direction you want it to appear from
    [UIView animateWithDuration:10.0 
                     animations:^{
                         geopointView.frame = // its final location
                     }];
}