ios图片剪切

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

UIImage *image = [UIImage imageNamed:@"1"];
//    截取屏幕位置
    CGImageRef dst = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(0, 0, 50, 50));
//    将截取的屏幕放在另一个view中
    _imageView.image = [UIImage imageWithCGImage:dst];
    
}
- (IBAction)paly:(id)sender {
    UIGraphicsBeginImageContext(self.view.frame.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    _imageView.image = image;
    
    NSData *jpgData = UIImageJPEGRepresentation(image, 0);
    [jpgData writeToFile:@"/Users/apple/Desktop/test.jpg" atomically:YES];
    
    NSData *pngData = UIImagePNGRepresentation(image);
    [pngData writeToFile:@"/Users/apple/Desktop/test.png" atomically:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
   
    
}

@end