- (UIImage *)imageClicpCircleWithRect:(CGRect)rect;

#import "UIImage+ImageCircle.h"

@interface View : UIView

@property (nonatomic, strong) UIImage * image;

@end

@implementation View

- (void)drawRect:(CGRect)rect {

    CGContextRef contextRef = UIGraphicsGetCurrentContext();

    CGContextSaveGState(contextRef);

    // Ellipse --> 椭圆的

    CGContextAddEllipseInRect(contextRef, CGRectMake(rect.size.width / , rect.size.height / , rect.size.width / , rect.size.height / ));

    CGContextClip(contextRef);

    CGContextFillPath(contextRef);

    [self.image drawAtPoint:CGPointMake(, )];

    CGContextRestoreGState(contextRef);

}

@end

@implementation UIImage (ImageCircle)

- (UIImage *)imageClicpCircleWithRect:(CGRect)rect {

    View * myView = [[View alloc] init];

    myView.image = self;

    UIGraphicsBeginImageContext(rect.size);

    CGContextRef context = UIGraphicsGetCurrentContext();

    myView.frame = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);

    myView.backgroundColor = [UIColor orangeColor];

    [myView.layer renderInContext:context];

    UIImage * imageNew = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return imageNew;

}

@end

- (UIImageView *)imageView {

    if (_imageView == nil) {

        self.imageView = [[UIImageView alloc] init];

        self.imageView.backgroundColor = [UIColor redColor];

        UIImage * image = [UIImage imageNamed:@"1.jpg"];

        // 裁剪出来一个在原图中心点,半径为四分之一原图宽高最小值的圆.

        CGFloat imageSi* = MIN(image.size.width, image.size.height);

        CGFloat circleImageWH = imageSi*;

        CGFloat circleImage_x = (image.size.width - circleImageWH) / ;

        CGFloat circleImage_y = (image.size.height - circleImageWH) / ;

        self.imageView.image = [image imageClicpCircleWithRect:CGRectMake(circleImage_x, circleImage_y, circleImageWH, circleImageWH)];

    } return _imageView;

}