我现在使用如下方法对屏幕截图：
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
currentCaptureImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
但我想要的是区域截图，也就是说，我要设置origin坐标，然后设置width和height，请问怎么做？
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http://segmentfault.com/q/10100000001... 我以前回答过
主要就是下面这句
CGRect rect =self.view.frame;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
float originX ;
float originy ;
float width ;
float height ;
//你需要的区域起点,宽,高;
CGRect rect1 = CGRectMake(originX , originY , width , height);
UIImage * imgeee = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([img CGImage], rect1)];