///将label画成image
- (UIImage *)imageWithLogoText:(UIImage *)img
text:(NSString *)text1
string:(NSString *)text2
str:(NSString *)text3
{
CGSize size = CGSizeMake(img.size.width, img.size.height); //设置上下文（画布）大小
UIGraphicsBeginImageContext(size); //创建一个基于位图的上下文(context)，并将其设置为当前上下文
CGContextRef contextRef = UIGraphicsGetCurrentContext(); //获取当前上下文
CGContextTranslateCTM(contextRef, 0, img.size.height); //画布的高度
CGContextScaleCTM(contextRef, 1.0, -1.0); //画布翻转
CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]); //在上下文种画当前图片
//上下文种的文字属性
CGContextTranslateCTM(contextRef, 0, img.size.height);
CGContextScaleCTM(contextRef, 1.0, -1.0);
[text1 drawInRect:CGRectMake(35, 30, img.size.width, 200) withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:64],NSForegroundColorAttributeName:[UIColor whiteColor]}];
[text2 drawInRect:CGRectMake(35, (img.size.height/2) - 100, img.size.width, 200) withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:64],NSForegroundColorAttributeName:[UIColor whiteColor]}];
[text3 drawInRect:CGRectMake(35, img.size.height - 100, img.size.width, 200) withAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:48],NSForegroundColorAttributeName:[UIColor whiteColor]}];
UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext(); //从当前上下文种获取图片
UIGraphicsEndImageContext(); //移除栈顶的基于当前位图的图形上下文。
return targetimg;
}
