Question

I am resizing a image to fit it in a bar. I need to resize it because the image is in a db and this is use for the same app in android too. the thing is this code is working well in iOS 6.1 but in lower 5.0 5.1 I am having a black image in the bar. The code is the following:

CGSize newSize=CGSizeMake(320,44);
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.navigationController.navigationBar setBackgroundImage:newImage  forBarMetrics:UIBarMetricsDefault];

some ideas of this wrong behavior?

Thanks

Answer 1

Use following method for specific hight and width with image

+ (UIImage*)resizeImage:(UIImage*)image withWidth:(int)width withHeight:(int)height
{
    CGSize newSize = CGSizeMake(width, height);
    float widthRatio = newSize.width/image.size.width;
    float heightRatio = newSize.height/image.size.height;

    if(widthRatio > heightRatio)
    {
        newSize=CGSizeMake(image.size.width*heightRatio,image.size.height*heightRatio);
    }
    else
    {
        newSize=CGSizeMake(image.size.width*widthRatio,image.size.height*widthRatio);
    }


    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

This method return NewImage, with specific size that you specify 🙂
This code may be helpful for you:)