iOS如何实现图片合并及截图

小编给大家分享一下iOS如何实现图片合并及截图，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

两张图片合并
-(UIImage *)addImage:(UIImage *)p_w_picpath2 toImage:(UIImage *)p_w_picpath3
{
UIGraphicsBeginImageContext(p_w_picpath3.size);

//Draw p_w_picpath3
[p_w_picpath3 drawInRect:CGRectMake(0, 0, p_w_picpath3.size.width, p_w_picpath3.size.height)];

//Draw p_w_picpath2
[p_w_picpath2 drawInRect:CGRectMake(20, 20, p_w_picpath2.size.width, p_w_picpath2.size.height)];

UIImage *resultImage=UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resultImage;
}

截图
- (UIImage*) combineImageFromCuttingScreen {

UIGraphicsBeginImageContext(self.baseImageView.frame.size);
UIGraphicsBeginImageContextWithOptions(self.combineView.frame.size, YES, 1);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetShouldAntialias(context, YES);
CGContextSetShouldSmoothFonts(UIGraphicsGetCurrentContext(),YES);
CGContextSaveGState(context);
CGRect r = CGRectMake(0, 0, 320, 392);
UIRectClip(r);
[self.combineView.layer renderInContext:context];

UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return theImage;
}

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