iOS 图片裁剪

#import "ViewController.h"

@interface ViewController ()

@property(strong,nonatomic)UIImageView *imgView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
   
    self.imgView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 200, 200, 200)];
    [self.view addSubview:self.imgView];
    //图片裁剪重新生成一张照片
    
    //加载照片
    UIImage *image = [UIImage imageNamed:@""];
    
    //设置圆形裁剪区域，正切与图片
    //创建圆形的路径
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    //把路径设置为裁剪区域
    [path addClip];
    
    //绘制图片
    [image drawAtPoint:CGPointZero];
    
    //从上下文中获取图片
    UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();
    
    //关闭上下文
    UIGraphicsEndImageContext();
    
    self.imgView.image = clipImage;

}