Quartz2D之生成圆形头像、打水印、截图三种方法的封装

 1 typedef enum:NSUInteger{
 2     XQGConrnerTopLeftType,//左上角
 3     XQGConrnerTopRightType,//右上角
 4     XQGConrnerBottomLeftType,//左下角
 5     XQGConrnerBottomRightType,//右下角
 6 } XQGConrnerType;
 7 
 8 @interface UIImage (XQGQuartz2D)
 9 
10 
11 /**
12  *  得到一张带水印的图片
13  *
14  *  @param waterIMG       水印图片
15  *  @param bacIMG         背景图片
16  *  @param size           水印距离某个角的边距
17  *  @param XQGConrnerType 水印靠近背景哪个角上
18  *  @param scale          缩放比例，不缩放为1
19  *
20  *  @return UIImage
21  */
22 + (instancetype)getWatermarkImageWithWaterImage:(UIImage *)waterIMG
23                                        andImage:(UIImage *)bacIMG
24                                         andDistance:(CGSize)size
25                                       andWhichCorner:(XQGConrnerType)XQGConrnerType
26                                             andScale:(CGFloat)scale;
27 
28 /**
29  *  得到一张带边框的圆角头像
30  *
31  *  @param image  制作头像的图片
32  *  @param radius 头像半径
33  *  @param border 边框厚度，0为没有
34  *  @param color  边框颜色
35  *
36  *  @return UIImage
37  */
38 + (instancetype)getCircleIconWithImage:(UIImage *)image
39                               andRadius:(CGFloat)radius
40                               andBorder:(CGFloat)border
41                                andColor:(UIColor *)color;
42 /**
43  *  截图
44  *
45  *  @param view 需要被截图的view
46  *
47  *  @return UIImage
48  */
49　+　(void)ScreenshotsWithView:(UIView *)view andImage:(XQGBlock)image

 1  //开启上下文：基于位图（bitmap），所有的东西需要绘制到一张新的图片上去
 2     //size：新图片的尺寸
 3     //opaque：yes：不透明，no：透明
 4     //scale:伸缩尺寸；
 5     UIGraphicsBeginImageContextWithOptions(bacIMG.size, NO, 0.0);
 6     //画背景，背景大小即背景图片尺寸
 7     [bacIMG drawInRect:CGRectMake(0, 0, bacIMG.size.width, bacIMG.size.height)];
 8     //画水印，scale为1时水印大小等于原水印图片大小；
 9     CGFloat waterX;
10     CGFloat waterY;
11     CGFloat waterW = waterIMG.size.width * scale;
12     CGFloat waterH = waterIMG.size.height * scale;
13     //根据位置参数设定水印位于哪个角落，以及边距
14     switch (XQGConrnerType) 
15         case XQGConrnerBottomLeftType:
16             waterX = size.width;
17             waterY = bacIMG.size.height - size.height - waterIMG.size.height;
18             break;
19         case XQGConrnerTopLeftType:
20             waterX = size.width;
21             waterY = size.height;
22             break;
23         case XQGConrnerBottomRightType:
24             waterX = bacIMG.size.width - size.width - waterIMG.size.width;
25             waterY = bacIMG.size.height - size.height - waterIMG.size.height;
26             break;
27         case XQGConrnerTopRightType:
28             waterX = bacIMG.size.width - size.width - waterIMG.size.width;
29             waterY = size.height;
30             break;
31             
32         default:
33             break;
34     }
35     //把水印保存到上下文中
36     [waterIMG drawInRect:CGRectMake(waterX , waterY, waterW, waterH)];
37     //从上下文中取得制作完毕的UIImage对象
38     UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
39     return newImage;

 1 + (instancetype)getCircleIconWithImage:(UIImage *)image andRadius:(CGFloat)radius andBorder:(CGFloat)border andColor:(UIColor *)color
 2 {
 3     CGSize size = CGSizeMake(2 * radius, 2 * radius);
 4     UIGraphicsBeginImageContextWithOptions(size, NO, 0.0);
 5 
 6     //取得上下文
 7     CGContextRef ctx = UIGraphicsGetCurrentContext();
 8     //保存一个初始状态
 9     CGContextSaveGState(ctx);
10     //画裁剪范围
11     CGContextAddEllipseInRect(ctx, CGRectMake(0, 0, size.width, size.height));
12     //裁剪
13     CGContextClip(ctx);
14     //画图片
15     [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
16     //设置圆环，设置的为内圆环
17     //释放初始状态
18 CGContextRestoreGState(ctx);
19 //radius - border * 2设为圆环半径，头像总半径才能保持为radius，因为设置线段宽度为内外增加相同厚度；
20     CGContextAddArc(ctx, radius, radius, radius - border * 2, 0, M_PI * 2, 0);
21     CGContextSetLineWidth(ctx,  border);
22     [color setStroke];
23     CGContextStrokePath(ctx);
24     //从上下文中取得制作完毕的UIImage对象
25     UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
26     //关闭上下文
27     UIGraphicsEndImageContext();
28     
29     return newImage;
30 }

 1 +(void)ScreenshotsWithView:(UIView *)view andImage:(XQGBlock)image
 2 {
 3     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
 4         //1、开启上下文
 5         UIGraphicsBeginImageContextWithOptions(view.frame.size, YES, 0.0);
 6         //2、将控制器view的layer渲染到上下文，想要截啥就把哪个图层拿出来渲染
 7         [view.layer renderInContext:UIGraphicsGetCurrentContext()];
 8         //3、取出图片
 9         UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
10         //关闭上下文
11         UIGraphicsEndImageContext();
12         image(newImage);
13     });
14 }