在开发中我们经常需要在控制台中打印出一些数据，以验证我们代码的正确性。一般我们的需求都是会打印出网络请求的返回结果，返回的大部分都是json数据，但是直接输出json数据时中文总会以原始码文显示，而不是正常显示中文。
head = {
"is_auth" = "1.0";
"last_pack" = "1.0";
message = "\U64cd\U4f5c\U6210\U529f";
}
打印出的都是unicode编码，非常不方便我们迅速的理解。此时其实打印的结果基本没什么意义了。我们需要的是这样
"head" : {
"is_auth" : "1.0",
"last_pack" : "1.0",
"message" : "操作成功",
}
解决办法
- 使用代码
直接将json数据或者字典转换为NSData
// json数据或者NSDictionary转为NSData，responseObject为json数据或者NSDictionary
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:responseObject options:NSJSONWritingPrettyPrinted error:nil];
// NSData转为NSString
NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(@"jsonStr = %@", jsonStr);
- 重写description方法，也就是为字典或者数组添加一个分类
当字典或者数组被打印的时候，系统自动调用重写的description方法不需要将该分类导入到任何类中。
description方法有3个方法- descriptionWithLocale:indent:
- descriptionWithLocale:
- description
这3个方法的调用顺序如下，
descriptionWithLocale:indent:-> descriptionWithLocale:
-> description
官方文档中也说明了调用顺序
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.
分类代码如下
#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（不推荐）
FKConsole是一个用于在Xcode控制台显示中文的插件。地址直达这里
详情请查看官方的文档，这里只贴出效果
