ios 动画中的子视图幻灯片，iphone
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SubView slide in animation, iphone
提问by alekhine
I have a UIview Containing two UIButtons.
我有一个包含两个 UIButton 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];
}
I want to animate slide in of UIview when following method is called.
我想在调用以下方法时为 UIview 的滑入设置动画。
-(void) showAnimation
I tried to do it by following way but I can see no animation. How can I do it?
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？
-(void) showAnimation{
[UIView animateWithDuration:10.0 animations:^{
[self.view addSubview:geopointView];
}];
}
Thannks for any help in advance.
提前感谢您的任何帮助。
回答by Adam Eberbach
You need to add the subview with a frame value that is where you want the animation to begin from (off-screen?) then change the frame value inside your animation block. The frame will change over the duration, causing the appearance of movement. The view must already be a subview - I don't believe adding a subview is something you can animate, it makes no sense.
您需要添加具有帧值的子视图，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。帧会随着时间的推移而改变，从而导致运动的出现。该视图必须已经是一个子视图 - 我不相信添加子视图是您可以制作动画的东西，这是没有意义的。
-(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
}];
}
