iOS解NSArray,NSDictionary unicode

问题

看代码

//创建数组
NSArray *array = @[@"abc",@"中文"];
//创建字典
NSDictionary *dict = @{@"key1" : @"abc",
                       @"key2" : @"中文",
                       };
//打印数组和字典
NSLog(@" \n dict = %@ \n array = %@",dict,array);

结果

(lldb) po array
<__NSArrayI 0x7fc6e420d620>(
abc,
中文
)


(lldb) po dict
{
    key1 = abc;
    key2 = "\U4e2d\U6587";
}

2016-12-20 13:58:18.492 TSUnicodeFormant[55360:1772807]  
 dict = {
    key1 = abc;
    key2 = "\U4e2d\U6587";
} 
 array = (
    abc,
    "\U4e2d\U6587"
)
(lldb) 

结论

NSLog与po的的表现不尽一致，所以对NSDictionary要进行两方面处理。

分析

国际惯例，当遇到问题时候。四个步骤apple Document->google->github->百度

查看文档

• 已知其实无论NSLog还是po,都会调用description方法，description是NSObject的方法。
  所以以description搜索，找到descriptionWithLocale:(NSArray,NSDictionary都有)

Returns a string object that represents the contents of the dictionary, formatted as a property list.

解决方案

重写descriptionWithLocale:，这里写在分类里

-(NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString *msr = [NSMutableString string];
    [msr appendString:@"["];
    for (id obj in self) {
        [msr appendFormat:@"\n\t%@,",obj];
    }
    //去掉最后一个逗号（,）
    if ([msr hasSuffix:@","]) {
        NSString *str = [msr substringToIndex:msr.length - 1];
        msr = [NSMutableString stringWithString:str];
    }
    [msr appendString:@"\n]"];
    return msr;
}

进行测试，

(lldb) po dict
{
    key1 = abc;
    key2 = "\U4e2d\U6587";
}

2016-12-20 14:35:48.002 TSUnicodeFormant[56085:1799830]  
 dict = {
    key1 = abc,
    key2 = 中文
} 
 array = [
    abc,
    中文
]
(lldb) 

可以看出，就剩下po有问题了。
万般无奈，只能用黑魔法了。首先在项目导入 JRSwizzle 库，在合理的地方，加入

[NSDictionary jr_swizzleMethod:@selector(description) withMethod:@selector(my_description) error:nil];

在分类里对description进行置换

- (NSString*)my_description {
    NSString *desc = [self my_description];
    desc = [NSString stringWithCString:[desc cStringUsingEncoding:NSUTF8StringEncoding] encoding:NSNonLossyASCIIStringEncoding];
    return desc;
}

完美结果

(lldb) po dict
{
    key1 = abc;
    key2 = "中文";
}

2016-12-20 14:41:25.558 TSUnicodeFormant[56284:1805511]  
 dict = {
    key1 = abc,
    key2 = 中文
} 
 array = [
    abc,
    中文
]
(lldb) 

Demo

git地址TSUnicodeFormant