YYText/Demo/YYTextDemo/NSBundle+YYAdd.m

//
//  NSBundle+YYAdd.m
//  YYCategories <https://github.com/ibireme/YYCategories>
//
//  Created by ibireme on 14/10/20.
//  Copyright (c) 2015 ibireme.
//
//  This source code is licensed under the MIT-style license found in the
//  LICENSE file in the root directory of this source tree.
//

#import "NSBundle+YYAdd.h"
#import "NSString+YYAdd.h"


@implementation NSBundle (YYAdd)

+ (NSArray *)preferredScales {
    static NSArray *scales;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        CGFloat screenScale = [UIScreen mainScreen].scale;
        if (screenScale <= 1) {
            scales = @[@1,@2,@3];
        } else if (screenScale <= 2) {
            scales = @[@2,@3,@1];
        } else {
            scales = @[@3,@2,@1];
        }
    });
    return scales;
}

+ (NSString *)pathForScaledResource:(NSString *)name ofType:(NSString *)ext inDirectory:(NSString *)bundlePath {
    if (name.length == 0) return nil;
    if ([name hasSuffix:@"/"]) return [self pathForResource:name ofType:ext inDirectory:bundlePath];
    
    NSString *path = nil;
    NSArray *scales = [self preferredScales];
    for (int s = 0; s < scales.count; s++) {
        CGFloat scale = ((NSNumber *)scales[s]).floatValue;
        NSString *scaledName = ext.length ? [name stringByAppendingNameScale:scale]
        : [name stringByAppendingPathScale:scale];
        path = [self pathForResource:scaledName ofType:ext inDirectory:bundlePath];
        if (path) break;
    }
    
    return path;
}

- (NSString *)pathForScaledResource:(NSString *)name ofType:(NSString *)ext {
    if (name.length == 0) return nil;
    if ([name hasSuffix:@"/"]) return [self pathForResource:name ofType:ext];
    
    NSString *path = nil;
    NSArray *scales = [NSBundle preferredScales];
    for (int s = 0; s < scales.count; s++) {
        CGFloat scale = ((NSNumber *)scales[s]).floatValue;
        NSString *scaledName = ext.length ? [name stringByAppendingNameScale:scale]
        : [name stringByAppendingPathScale:scale];
        path = [self pathForResource:scaledName ofType:ext];
        if (path) break;
    }
    
    return path;
}

- (NSString *)pathForScaledResource:(NSString *)name ofType:(NSString *)ext inDirectory:(NSString *)subpath {
    if (name.length == 0) return nil;
    if ([name hasSuffix:@"/"]) return [self pathForResource:name ofType:ext];
    
    NSString *path = nil;
    NSArray *scales = [NSBundle preferredScales];
    for (int s = 0; s < scales.count; s++) {
        CGFloat scale = ((NSNumber *)scales[s]).floatValue;
        NSString *scaledName = ext.length ? [name stringByAppendingNameScale:scale]
        : [name stringByAppendingPathScale:scale];
        path = [self pathForResource:scaledName ofType:ext inDirectory:subpath];
        if (path) break;
    }
    
    return path;
}

@end