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将一个View保存为PNG保存到本地
1.首先写一个UIImage的分类，加入这个方法。
+ (UIImage *)imageWithView:(UIView *)view {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, view.layer.contentsScale);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
2.搞定!
[UIImagePNGRepresentation([UIImage imageWithView:containerView]) writeToFile:file atomically:YES];
UIImagePNGRepresentation()将UIImage转换为PNG格式。
UIColor转换图片
+ (UIImage *)imageWithColor:(UIColor *)color forSize:(CGSize)size {
CGRect frameRect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(ctx, color.CGColor); //image frame color
CGContextFillRect(ctx, frameRect);
UIImage* resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultImage;
}
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原文地址：http://www.cnblogs.com/congliang/p/4576701.html
