// 从view上截图
- (UIImage *)getImage {UIGraphicsBeginImageContextWithOptions(CGSizeMake(150, 150), NO, 1.0); //NO，YES 控制是否透明[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();// 生成后的imagereturn image;
}// 根据给定得图片，从其指定区域截取一张新得图片
-(UIImage *)getImageFromImage{//大图bigImage//定义myImageRect，截图的区域CGRect myImageRect = CGRectMake(70, 10, 150, 150);UIImage* bigImage= [UIImage imageNamed:@"mm.jpg"];CGImageRef imageRef = bigImage.CGImage;CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, myImageRect);CGSize size;size.width = 150;size.height = 150;UIGraphicsBeginImageContext(size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextDrawImage(context, myImageRect, subImageRef);UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];UIGraphicsEndImageContext();return smallImage;
}
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