重写 NSArray、NSSet、NSDictionary 的输出方法，在Xcode实现中文（Unicode）字符在控制台的输出

原理

Xcode 控制台中在输出 NSArray、NSSet、NSDictionary 时，其中的中文字符会变成Unicode编码 如"\U67cf\U8367".

我们通过分类重写这些类的输出方法即可实现在控制台输出中文：

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

效果

先看看效果：

创建一个字典并输出:

NSData *strData = [@"str -> data格式的字符串" dataUsingEncoding:NSUTF8StringEncoding];

NSData *dicData = [NSJSONSerialization dataWithJSONObject:@{@"key0": @"字典 -> data 的数据",}
                                                      options:NSJSONWritingPrettyPrinted
                                                        error:nil];

NSMutableSet *set = [NSMutableSet setWithArray:@[@"set0",
                                                 strData,
                                                 dicData]];
NSDictionary *dic = @{@"name"  : @"BY",
                       @"My bolg" : @"http://qiubaiying.top",
                       @"count" : @(11),
                       @"strData" : strData,
                       @"dicData" : dicData,
                       @"set"     : set,
                       @"Unicode" : @"😀😁🤣😂😄",
                       @"contact" : @[@"BY Blog:http://qiubaiying.top",
                                      @"GitHub:https://github.com/qiubaiying",
                                      @"简书:https://http://www.jianshu.com/u/e71990ada2fd"]};
NSLog(@"%@", dic);

输出结果：

2017-03-01 10:36:45.709 BYFoundationLog_Demo[1657:53604] {
    "My bolg" = "http://qiubaiying.top";
    Unicode = "\Ud83d\Ude00\Ud83d\Ude01\Ud83e\Udd23\Ud83d\Ude02\Ud83d\Ude04";
    contact =     (
        "BY Blog:http://qiubaiying.top",
        "GitHub:https://github.com/qiubaiying",
        "\U7b80\U4e66:https://http://www.jianshu.com/u/e71990ada2fd"
    );
    count = 11;
    dicData = <7b0a2020 226b6579 3022203a 2022e5ad 97e585b8 202d3e20 64617461 20e79a84 e695b0e6 8dae220a 7d>;
    name = BY;
    set = "{(\n    <73747220 2d3e2064 617461e6 a0bce5bc 8fe79a84 e5ad97e7 aca6e4b8 b2>,\n    set0,\n    <7b0a2020 226b6579 3022203a 2022e5ad 97e585b8 202d3e20 64617461 20e79a84 e695b0e6 8dae220a 7d>\n)}";
    strData = <73747220 2d3e2064 617461e6 a0bce5bc 8fe79a84 e5ad97e7 aca6e4b8 b2>;
}

将BYFoundationLog.m拖入项目，再次运行

2017-03-01 10:35:52.545 BYFoundationLog_Demo[1635:52772]     {
    set =     {(
        "str -> data格式的字符串",
        "set0",
            {
            key0 = "字典 -> data 的数据",
        },
    )},
    Unicode = "😀😁🤣😂😄",
    strData = "str -> data格式的字符串",
    count = 11,
    dicData =     {
        key0 = "字典 -> data 的数据",
    },
    contact =     (
        "BY Blog:http://qiubaiying.top",
        "GitHub:https://github.com/qiubaiying",
        "简书:https://http://www.jianshu.com/u/e71990ada2fd",
    ),
    name = "BY",
    My bolg = "http://qiubaiying.top",
}

实现方法

以 NSArray 为例：

创建一个 NSArray 的分类，重写输出方法

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@implementation NSArray (Log)

- (NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level {
    NSMutableString *desc = [NSMutableString string];
    
    NSMutableString *tabString = [[NSMutableString alloc] initWithCapacity:level];
    for (NSUInteger i = 0; i < level; ++i) {
        [tabString appendString:@"\t"];
    }
    
    NSString *tab = @"";
    if (level > 0) {
        tab = tabString;
    }
    [desc appendString:@"\t(\n"];
    
    for (id obj in self) {
        if ([obj isKindOfClass:[NSDictionary class]]
            || [obj isKindOfClass:[NSArray class]]
            || [obj isKindOfClass:[NSSet class]]) {
            NSString *str = [((NSDictionary *)obj) descriptionWithLocale:locale indent:level + 1];
            [desc appendFormat:@"%@\t%@,\n", tab, str];
        } else if ([obj isKindOfClass:[NSString class]]) {
            [desc appendFormat:@"%@\t\"%@\",\n", tab, obj];
        } else if ([obj isKindOfClass:[NSData class]]) {
            
            NSError *error = nil;
            NSObject *result =  [NSJSONSerialization JSONObjectWithData:obj
                                                                options:NSJSONReadingMutableContainers
                                                                  error:&error];
            
            if (error == nil && result != nil) {
                if ([result isKindOfClass:[NSDictionary class]]
                    || [result isKindOfClass:[NSArray class]]
                    || [result isKindOfClass:[NSSet class]]) {
                    NSString *str = [((NSDictionary *)result) descriptionWithLocale:locale indent:level + 1];
                    [desc appendFormat:@"%@\t%@,\n", tab, str];
                } else if ([obj isKindOfClass:[NSString class]]) {
                    [desc appendFormat:@"%@\t\"%@\",\n", tab, result];
                }
            } else {
                @try {
                    NSString *str = [[NSString alloc] initWithData:obj encoding:NSUTF8StringEncoding];
                    if (str != nil) {
                        [desc appendFormat:@"%@\t\"%@\",\n", tab, str];
                    } else {
                        [desc appendFormat:@"%@\t%@,\n", tab, obj];
                    }
                }
                @catch (NSException *exception) {
                    [desc appendFormat:@"%@\t%@,\n", tab, obj];
                }
            }
        } else {
            [desc appendFormat:@"%@\t%@,\n", tab, obj];
        }
    }
    
    [desc appendFormat:@"%@)", tab];
    
    return desc;
}

@end

NSSet、NSDictionary 与 NSArray 实现方法类似

代码下载

代码及Demo地址：GitHub

使用方法

直接将 BYFoundationLog.m 文件拖入项目中就能使用