New image name for iPhone 5

Question

With the retina we make images with the @2x in the name. I see where the default image has to be default-568h@2x but this does not seem to be the case for other images. Like

Answer 1

There is no specific image name. Having the Default-568h@2x will launch that image on an iPhone 5 or iPod Touch 5G and will enable the non-letterbox mode. After that, you need to design your views to be flexible. There is no special "image name" or anything for the new size.

For your background, for example, you should probably be using an image that is capable of stretching or tiling and have it configured properly before setting it.

Answer 2

If you are using Xcode 5, you can use asset catalog (see usage there Apple's documentation)

Once your asset catalog is created [ UIImage imagedNamed: @"your_image_set" ] will pull right image based on device.

Answer 3

No special suffix for iPhone 5 (4'' display), just the specific Default-568h@2x.png file.

Here's a macro to handle it:

// iPhone 5 support
#define ASSET_BY_SCREEN_HEIGHT(regular, longScreen) (([[UIScreen mainScreen] bounds].size.height <= 480.0) ? regular : longScreen)

Usage: (assets names - image.png, image@2x.png, image-568h@2x.png)

myImage = [UIImage imageNamed:ASSET_BY_SCREEN_HEIGHT(@"image",@"image-568h")];

Answer 4

iPhone 5 does not have a different pixel density, it's the same retina display PPI as the iPhone 4/4S, it's just a different screen size. The @2x images will be used on iPhone 5 as well as 4/4S.

Answer 5

To complete Jason's answser, I would propose: What about overriding the UIImage's imageNamed: method to have it happen the "-568" suffix to the name of your image? Or add a new method called resolutionAdaptedImageNamed: to the UIImage maybe using a category.

If I have a bit of time in the next days, I will try to post the code for that.

Caution: will not work for images in the Nib files.

Answer 6

You can also make category for this just make category as below .

UIImage+Retina4.h
#import <UIKit/UIKit.h>
#import <objc/runtime.h>
 @interface UIImage (Retina4)
 @end

UIImage+Retina4.m
#import "UIImage+Retina4.h"
static Method origImageNamedMethod = nil;
@implementation UIImage (Retina4)

+ (void)initialize {
origImageNamedMethod = class_getClassMethod(self, @selector(imageNamed:));
method_exchangeImplementations(origImageNamedMethod,
                               class_getClassMethod(self, @selector(retina4ImageNamed:)));
}
+ (UIImage *)retina4ImageNamed:(NSString *)imageName {
// NSLog(@"Loading image named => %@", imageName);
NSMutableString *imageNameMutable = [imageName mutableCopy];
NSRange retinaAtSymbol = [imageName rangeOfString:@"@"];
if (retinaAtSymbol.location != NSNotFound) {
    [imageNameMutable insertString:@"-568h" atIndex:retinaAtSymbol.location];
} else {
    CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;
    if ([UIScreen mainScreen].scale == 2.f && screenHeight == 568.0f) {
        NSRange dot = [imageName rangeOfString:@"."];
        if (dot.location != NSNotFound) {
            [imageNameMutable insertString:@"-568h@2x" atIndex:dot.location];
        } else {
            [imageNameMutable appendString:@"-568h@2x"];
        }
    }
}

NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageNameMutable ofType:@"png"];
if (imagePath) {
    return [UIImage retina4ImageNamed:imageNameMutable];
} else {
    return [UIImage retina4ImageNamed:imageName];
}
return nil;
}

@end

And you can directly check using import this category as below where you wont to check 568 or normal image

imgvBackground.image=[UIImage imageNamed:@"bkground_bg"];//image name without extantion