Nslog output Chinese

Xcode In print log When , Chinese will be converted into hexadecimal encoding output , Inconvenient to view , Most of the solutions on the Internet are to rewrite the following method ：

- (NSString *)descriptionWithLocale:(nullable id)locale indent:(NSUInteger)level;

When the nested format of data is deep , If this printing method is not formatted , It is difficult to see the hierarchical structure of data , If you want to print data by indenting levels , The code is a little more complicated . Here is another implementation found on the Internet , After testing, it is found that it is easy to use , Share here .

1. establish  NSArry and NSDictionary Of category.
2. stay .m Add the following code to .

+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        hc_swizzleSelector([self class], @selector(descriptionWithLocale:indent:), @selector(hc_descriptionWithLocale:indent:));
    });
}

- (NSString *)hc_descriptionWithLocale:(id)locale indent:(NSUInteger)level {
    return [self stringByReplaceUnicode:[self hc_descriptionWithLocale:locale indent:level]];
}

- (NSString *)stringByReplaceUnicode:(NSString *)unicodeString {
    NSMutableString *convertedString = [unicodeString mutableCopy];
    [convertedString replaceOccurrencesOfString:@"\\U" withString:@"\\u" options:0 range:NSMakeRange(0, convertedString.length)];
    CFStringRef transform = CFSTR("Any-Hex/Java");
    CFStringTransform((__bridge CFMutableStringRef)convertedString, NULL, transform, YES);
    
    return convertedString;
}

static inline void hc_swizzleSelector(Class theClass, SEL originalSelector, SEL swizzledSelector) {
    Method originalMethod = class_getInstanceMethod(theClass, originalSelector);
    Method swizzledMethod = class_getInstanceMethod(theClass, swizzledSelector);
    
    BOOL didAddMethod =
    class_addMethod(theClass,
                    originalSelector,
                    method_getImplementation(swizzledMethod),
                    method_getTypeEncoding(swizzledMethod));
    
    if (didAddMethod) {
        class_replaceMethod(theClass,
                            swizzledSelector,
                            method_getImplementation(originalMethod),
                            method_getTypeEncoding(originalMethod));
    } else {
        method_exchangeImplementations(originalMethod, swizzledMethod);
    }
}

Be careful ： Because the runtime is used , So you need to add a header file  .

#import <objc/runtime.h>