这种绘制是根据图片的像素比例 等比例进行绘制的，在选择图片和创建展示图片的imageView 时，注意查看尺寸 注：绘图时使用 [UIScreen mainScreen].scale 可以是图片更清晰 UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);//这样就不模糊了
//图片上添加文字 详细版
- (UIImage*)text:(NSString*)text addToView:(UIImage*)image{
//设置字体样式
UIFont*font = [UIFont fontWithName:@"Arial-BoldItalicMT"size:100];
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:text];
[str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0, 1)];
[str addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:100] range:NSMakeRange(0, text.length)];
// CGSize textSize = [text sizeWithAttributes:dict];
CGSize textSize = [str size];
//绘制上下文
UIGraphicsBeginImageContext(image.size);
//UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);//这样就不模糊了
[image drawInRect:CGRectMake(0,0, image.size.width, image.size.height)];
// int border =10;
CGRect re = {CGPointMake((image.size.width- textSize.width)/2, 200), textSize};
// CGRect rect = CGRectMake(0, 0, image.size.width, 500);
//此方法必须写在上下文才生效
[str drawInRect:re ];
UIImage*newImage =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
//修改图片尺寸
- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
{
// Create a graphics image context
UIGraphicsBeginImageContext(newSize);//这样压缩的图片展示出来会很模糊
//UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);//这样就不模糊了
//UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);//这样就不模糊了
// Tell the old image to draw in this new context, with the desired
// new size
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Get the new image from the context
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
// End the context
UIGraphicsEndImageContext();
// Return the new image.
return newImage;
}
//圆角
- (UIImage *) getRadioImaeg:(NSString *)imageName1{
UIImage *image1 = [UIImage imageNamed:imageName1];
UIGraphicsBeginImageContextWithOptions(image1.size, 0, 0);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGRect rect = CGRectMake(00, 0, image1.size.width, image1.size.width);
CGContextAddEllipseInRect(ctx, rect);
CGContextClip(ctx);
[image1 drawInRect:rect];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
//图片叠加
- (UIImage *)addImage:(NSString *)imageName1 withImage:(NSString *)imageName2 {
UIImage *image1 = [UIImage imageNamed:imageName1];
UIImage *image2 = [self getRadioImaeg:@"333"];
UIGraphicsBeginImageContext(image1.size);
//UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);//这样就不模糊了
[image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];
[image2 drawInRect:CGRectMake((image1.size.width - image2.size.width)/2,(image1.size.height - image2.size.height)/2, image2.size.width, image2.size.height)];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
