weChat聊天发送图片带有小尖角的实现

1.#import <UIKit/UIKit.h>
2.
3.@interface JKShapeImage : UIView
4.
5.@property (nonatomic,strong) UIImage *image;
6.
7.@property (nonatomic,getter=isOnLeft,assign) BOOL onLeft;
8.
9.@end

1.#import "JKShapeImage.h"
2.
3.@interface JKShapeImage ()
4.{
5.    CAShapeLayer *maskLayer;
6.    CALayer *contentLayer;
7.}
8.@end
9.
10.@implementation JKShapeImage
11.
12.-(instancetype)initWithFrame:(CGRect)frame{
13.    if (self = [super initWithFrame:frame]) {
14.        [self setShapeMask];
15.    }
16.    return self;
17.}
18.
19.-(void)setFrame:(CGRect)frame{
20.    [super setFrame:frame];
21.}
22.
23.-(void)setShapeMask{
24.    maskLayer = [CAShapeLayer layer];
25.    maskLayer = [CAShapeLayer layer];
26.    maskLayer.fillColor = [UIColor blackColor].CGColor;
27.    maskLayer.strokeColor = [UIColor clearColor].CGColor;
28.    maskLayer.frame = self.bounds;
29.    maskLayer.contentsCenter = CGRectMake(0.65, 0.65, 0.2, 0.2);
30.    maskLayer.contentsScale = [UIScreen mainScreen].scale;                 //非常关键设置自动拉伸的效果且不变形
31.
32.    CGFloat w = self.bounds.size.width;
33.    CGFloat h = self.bounds.size.height;
34.
35.    UIBezierPath *path = [UIBezierPath bezierPath];
36.    if (self.isOnLeft) {
37.        [path moveToPoint:CGPointMake(9, 0)];
38.        [path addLineToPoint:CGPointMake(w, 0)];
39.        [path addLineToPoint:CGPointMake(w, h)];
40.        [path addLineToPoint:CGPointMake(9, h)];
41.        [path addLineToPoint:CGPointMake(9, 25)];
42.        [path addLineToPoint:CGPointMake(0, 20)];
43.        [path addLineToPoint:CGPointMake(9, 15)];
44.        [path addLineToPoint:CGPointMake(9, 0)];
45.    }else{
46.        [path moveToPoint:CGPointMake(0, 0)];
47.        [path addLineToPoint:CGPointMake(w - 9, 0)];
48.        [path addLineToPoint:CGPointMake(w - 9, 15)];
49.        [path addLineToPoint:CGPointMake(w, 20)];
50.        [path addLineToPoint:CGPointMake(w - 9, 25)];
51.        [path addLineToPoint:CGPointMake(w - 9, h)];
52.        [path addLineToPoint:CGPointMake(0, h)];
53.        [path addLineToPoint:CGPointMake(0, 0)];
54.    }
55.    maskLayer.path = path.CGPath;
56.
57.
58.    contentLayer = [CALayer layer];
59.    contentLayer.mask = maskLayer;
60.    contentLayer.frame = self.bounds;
61.    [self.layer addSublayer:contentLayer];
62.
63.}
64.
65.-(void)setImage:(UIImage *)image{
66.    _image = image;
67.    contentLayer.contents = (__bridge id)image.CGImage;
68.}

实现效果