子视图滑块，iphone

Question

我有一个UIView含有两个UIButtons。

-(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]; 
} 

我想在下面的方法被调用时在UIview中滑动滑动。

-(void) showAnimation 

我试图按照以下方式做，但我看不到动画。我该怎么做？

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

Thannks提前的任何帮助。

Answer 1

你需要用帧值也就是你希望动画从开始添加子视图（关屏？）然后改变你的动画块内的帧值。框架会在整个持续时间内发生变化，导致运动的出现。该视图必须已经是一个子视图 - 我不认为添加子视图是可以进行动画制作的，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 
        }]; 
}