在開發(fā)中我們經(jīng)常需要在控制臺(tái)中打印出一些數(shù)據(jù)，以驗(yàn)證我們代碼的正確性。一般我們的需求都是會(huì)打印出網(wǎng)絡(luò)請(qǐng)求的返回結(jié)果，返回的大部分都是json數(shù)據(jù)，但是直接輸出json數(shù)據(jù)時(shí)中文總會(huì)以原始碼文顯示，而不是正常顯示中文。

head =  {
            "is_auth" = "1.0";
            "last_pack" = "1.0";
            message = "\U64cd\U4f5c\U6210\U529f";
         }

打印出的都是unicode編碼，非常不方便我們迅速的理解。此時(shí)其實(shí)打印的結(jié)果基本沒什么意義了。我們需要的是這樣

"head" : {
      "is_auth" : "1.0",
      "last_pack" : "1.0",
      "message" : "操作成功",
      }

解決辦法

• 使用代碼
  直接將json數(shù)據(jù)或者字典轉(zhuǎn)換為NSData

// json數(shù)據(jù)或者NSDictionary轉(zhuǎn)為NSData，responseObject為json數(shù)據(jù)或者NSDictionary
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:responseObject options:NSJSONWritingPrettyPrinted error:nil];
// NSData轉(zhuǎn)為NSString
NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(@"jsonStr = %@", jsonStr);

• 重寫description方法，也就是為字典或者數(shù)組添加一個(gè)分類
  當(dāng)字典或者數(shù)組被打印的時(shí)候，系統(tǒng)自動(dòng)調(diào)用重寫的description方法不需要將該分類導(dǎo)入到任何類中。
  description方法有3個(gè)方法
  • descriptionWithLocale:indent:
  • descriptionWithLocale:
  • description
    這3個(gè)方法的調(diào)用順序如下，
    descriptionWithLocale:indent:-> descriptionWithLocale:
    -> description
    官方文檔中也說明了調(diào)用順序

The returned NSString object contains the string representations of each of the dictionary’s entries. descriptionWithLocale:indent: obtains the string representation of a given key or value as follows:
If the object is an NSString object, it is used as is.
If the object responds to descriptionWithLocale:indent:, that method is invoked to obtain the object’s string representation.
If the object responds to descriptionWithLocale:, that method is invoked to obtain the object’s string representation.
If none of the above conditions is met, the object’s string representation is obtained by through its description property.

分類代碼如下

#import "NSDictionary+Log.h"

@implementation NSDictionary (Log)

- (NSString *)descriptionWithLocale:(id)locale{
    
    NSMutableString *strM = [NSMutableString stringWithString:@"{\n"];
    
    [self enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        [strM appendFormat:@"\t%@ = %@;\n", key, obj];
    }];
    
    [strM appendString:@"}\n"];
    
    return strM;
}

@end

@implementation NSArray (Log)

- (NSString *)descriptionWithLocale:(id)locale{
    NSMutableString *strM = [NSMutableString stringWithString:@"(\n"];
    
    [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        [strM appendFormat:@"\t%@,\n", obj];
    }];
    
    [strM appendString:@")"];
    
    return strM;
}

@end

• 使用第三方插件（不推薦）
  FKConsole是一個(gè)用于在Xcode控制臺(tái)顯示中文的插件。地址直達(dá)這里
  詳情請(qǐng)查看官方的文檔，這里只貼出效果