iOS自定义裁剪区域 正方形圆形图片头像裁剪 仿QQ头像裁剪 圆形遮罩 矩型遮罩

最近项目中用到了自定义图片裁剪区域的图片裁剪功能，自己写了一个，可能有诸多不完善的地方，请大家指正。

支持任意区域裁剪，9:16裁剪、16:9裁剪、1:1裁剪、圆形裁剪等等，总之裁剪框的大小，裁剪框的区域都自定义；

如下截图：

整体思路：

1.利用scrollview的zoom缩放功能，缩放对象是所需裁剪图片的imageView；

2.利用scrollView的contentInset参数，保证裁剪图片在裁剪框内，并且可以裁剪图片任意位置；

3.坐标转换找出裁剪区域对应的在图片中的位置，进行图片的渲染裁剪。

使用方法

LZImageCropping *imageBrowser = [[LZImageCropping alloc]init];//设置代理imageBrowser.delegate = self;//设置自定义裁剪区域大小imageBrowser.cropSize = CGSizeMake(self.view.frame.size.width - 60, (self.view.frame.size.width-60));//设置图片NSString *path = [[NSBundle mainBundle] pathForResource:@"IMG_1121" ofType:@"jpg"];UIImage *image = [UIImage imageWithContentsOfFile:path];cropper.image = image;//是否需要圆形imageBrowser.isRound = YES;[self presentViewController:imageBrowser animated:YES completion:nil];

以下为关键代码

二、自定义矩形遮罩 圆形遮罩 处理

透明区域是用了两条贝塞尔曲线，第一条是整个灰色区域，然后第二条是需要透明的区域。将第二条附加的第一条上，并且设置填充规则为：

shapeLayer.fillRule = kCAFillRuleEvenOdd;

矩形遮罩

//矩形裁剪区域- (void)transparentCutSquareArea{//圆形透明区域UIBezierPath *alphaPath = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, _selfWidth, _selfHeight)];UIBezierPath *squarePath = [UIBezierPath bezierPathWithRect:_cropFrame];[alphaPath appendPath:squarePath];CAShapeLayer *shapeLayer = [CAShapeLayer layer];shapeLayer.path = alphaPath.CGPath;shapeLayer.fillRule = kCAFillRuleEvenOdd;self.overLayView.layer.mask = shapeLayer;//裁剪框UIBezierPath *cropPath = [UIBezierPath bezierPathWithRect:CGRectMake(_cropFrame.origin.x-1, _cropFrame.origin.y-1, _cropFrame.size.width+2, _cropFrame.size.height+2)];CAShapeLayer *cropLayer = [CAShapeLayer layer];cropLayer.path = cropPath.CGPath;cropLayer.fillColor = [UIColor whiteColor].CGColor;cropLayer.strokeColor = [UIColor whiteColor].CGColor;[self.overLayView.layer addSublayer:cropLayer];}

圆形裁剪遮罩

//圆形裁剪区域-(void)transparentCutRoundArea{CGFloat arcX = _cropFrame.origin.x + _cropFrame.size.width/2;CGFloat arcY = _cropFrame.origin.y + _cropFrame.size.height/2;CGFloat arcRadius;if (_cropSize.height > _cropSize.width) {arcRadius = _cropSize.width/2;}else{arcRadius = _cropSize.height/2;}//圆形透明区域UIBezierPath *alphaPath = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, _selfWidth, _selfHeight)];UIBezierPath *arcPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(arcX, arcY) radius:arcRadius startAngle:0 endAngle:2*M_PI clockwise:NO];[alphaPath appendPath:arcPath];CAShapeLayer *layer = [CAShapeLayer layer];layer.path = alphaPath.CGPath;layer.fillRule = kCAFillRuleEvenOdd;self.overLayView.layer.mask = layer;//裁剪框UIBezierPath *cropPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(arcX, arcY) radius:arcRadius+1 startAngle:0 endAngle:2*M_PI clockwise:NO];CAShapeLayer *cropLayer = [CAShapeLayer layer];cropLayer.path = cropPath.CGPath;cropLayer.strokeColor = [UIColor whiteColor].CGColor;cropLayer.fillColor = [UIColor whiteColor].CGColor;[self.overLayView.layer addSublayer:cropLayer];}

三、裁剪图片

裁剪矩形图片

-(UIImage *)getSubImage{//裁剪区域在原始图片上的位置CGRect myImageRect = CGRectMake(leftTopPoint.x * scaleRatio, leftTopPoint.y*scaleRatio, width, height);//裁剪图片CGImageRef imageRef = self.image.CGImage;CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, myImageRect);UIGraphicsBeginImageContext(myImageRect.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextDrawImage(context, myImageRect, subImageRef);UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];CGImageRelease(subImageRef);UIGraphicsEndImageContext();//是否需要圆形图片if (self.isRound) {//将图片裁剪成圆形smallImage = [self clipCircularImage:smallImage];}return smallImage;}

裁剪圆形图片

//将图片裁剪成圆形-(UIImage *)clipCircularImage:(UIImage *)image{CGFloat arcCenterX = image.size.width/ 2;CGFloat arcCenterY = image.size.height / 2;UIGraphicsBeginImageContext(image.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextBeginPath(context);CGContextAddArc(context, arcCenterX, arcCenterY, image.size.width/2, 0.0, 2*M_PI, NO);CGContextClip(context);CGRect myRect = CGRectMake(0 , 0, image.size.width , image.size.height);[image drawInRect:myRect];UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return newImage;}

最后

代码很简单，大家自己的需求可以直接在demo里面修改，具体代码详见github，帮助到你的话，可以随手给个星星哦！

代码： /FirstStepzz/LZImageCropping.git