使用UIView的animation

#import "ViewController.h"
/**
 *  用UIView实现简单的动画效果
 */
@interface ViewController ()
{
    UIImageView *myImageV;
}
@end
@implementation ViewController

- (void)viewDidLoad {
    
    myImageV=[[UIImageView alloc]initWithFrame:CGRectMake(100, 44, 100, 100)];
    myImageV.image=[UIImage imageNamed:@"Tutorial_p4.png"];
    //注意：一定要设置图片视图的这个属性，否则将无法响应点击事件
    myImageV.userInteractionEnabled=YES;
    [self.view addSubview:myImageV];
    UITapGestureRecognizer *tapGR=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(dropAction)];
    [myImageV addGestureRecognizer:tapGR];
}


/**
 *  图片的点击事件，点击图片将会出现掉落效果
 */
-(void)dropAction{
    [UIView animateWithDuration:3.0f animations:^{
        //让imageView离开界面时的掉落效果
        myImageV.frame=CGRectMake(0, 1000, 100, 100);
        NSLog(@"掉落事件");
    }];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end