点击图少时图片放大（VertigoDemo)

#import <UIKit/UIKit.h>
//加入代理
@interface RootViewController : UIViewController
<UIViewControllerTransitioningDelegate>
{
    UIImageView *imageView;
}
@end

#import "RootViewController.h"
//加入头文件
#import "TGRImageViewController.h"
#import "TGRImageZoomAnimationController.h"

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];
    imageView.image=[UIImage imageNamed:@"1.jpg"];
    [self.view addSubview:imageView];
    
    
    UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];
    btn.backgroundColor=[UIColor clearColor];
    [btn addTarget:self action:@selector(doClickButton:) forControlEvents:UIControlEventTouchUpInside];
    btn.imageView.contentMode = UIViewContentModeScaleAspectFill;
    [self.view addSubview:btn];
    
}
-(void)doClickButton:(UIButton *)btn
{
    TGRImageViewController *viewController = [[TGRImageViewController alloc] initWithImage:imageView.image];
    viewController.transitioningDelegate = self;
    [self presentViewController:viewController animated:NO completion:nil];

}