原文出自:标哥的技术博客
前言
开发中经常需要打印日志以查看数据是否正确,或者说查看数据的格式。但是,苹果对于我们的NSDictionary
、NSSet
、NSArray
等值有中文时,打印出来的是Unicode
编码,人类无法直接读懂,因此,笔者研究研究如何将打印出来的日志保持原有的格式化且能够将Unicode
编码打印出来是正常人类可读懂的中文。
实现原理
苹果给我们提供了本地化的方法,对于NSDictionary
、NSSet
、NSArray
都可以重写该方法来实现:
NSSet实现
对于NSSet
实现如下:
- (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 = @"\t";
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 {
[desc appendFormat:@"%@\t%@,\n", tab, obj];
}
}
[desc appendFormat:@"%@)}", tab];
return desc;
}
我们这里根本缩进级别来生成对应的格式化字符串,以便解决多级嵌套时格式不太美观的问题。
NSArray实现
对于NSArray
的实现如下:
- (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 {
[desc appendFormat:@"%@\t%@,\n", tab, obj];
}
}
[desc appendFormat:@"%@)", tab];
return desc;
}
同样的道理,不过笔者对于字符串值,都加上了双引号,一眼就可以看出来是字符串类型。
NSDictionary实现
对于NSDictonary的实现如下:
- (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"];
// 遍历数组,self就是当前的数组
for (id key in self.allKeys) {
id obj = [self objectForKey:key];
if ([obj isKindOfClass:[NSString class]]) {
[desc appendFormat:@"%@\t%@ = \"%@\",\n", tab, key, obj];
} else if ([obj isKindOfClass:[NSArray class]]
|| [obj isKindOfClass:[NSDictionary class]]
|| [obj isKindOfClass:[NSSet class]]) {
[desc appendFormat:@"%@\t%@ = %@,\n", tab, key, [obj descriptionWithLocale:locale indent:level + 1]];
} else {
[desc appendFormat:@"%@\t%@ = %@,\n", tab, key, obj];
}
}
[desc appendFormat:@"%@}", tab];
return desc;
}
字典打印出来的格式是{}这样的结构,我们一样要考虑嵌套情况,并且根据嵌套添加对应的级别缩进。
升级版本到Version1.0
新增NSData类型自动打印出可视化内容,只要是新增类似这样的处理:
else if ([obj isKindOfClass:[NSData class]]) {
// 如果是NSData类型,尝试去解析结果,以打印出可阅读的数据
NSError *error = nil;
NSObject *result = [NSJSONSerialization JSONObjectWithData:obj
options:NSJSONReadingMutableContainers
error:&error];
// 解析成功
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, key, str];
} else if ([obj isKindOfClass:[NSString class]]) {
[desc appendFormat:@"%@\t%@ = \"%@\",\n", tab, key, result];
}
} else {
@try {
NSString *str = [[NSString alloc] initWithData:obj encoding:NSUTF8StringEncoding];
if (str != nil) {
[desc appendFormat:@"%@\t%@ = \"%@\",\n", tab, key, str];
} else {
[desc appendFormat:@"%@\t%@ = %@,\n", tab, key, obj];
}
}
@catch (NSException *exception) {
[desc appendFormat:@"%@\t%@ = %@,\n", tab, key, obj];
}
}
}
我们只是尝试去解析可视化数据,若解析成功则显示出来,若解析失败就原样输出。
测试
我们来测试一下效果,我们打印如下一个字典:
NSString *str = @"我是转换成data格式的字符串";
NSData *dataString = [NSData dataWithBytes:str.UTF8String length:str.length];
NSDictionary *dataSet = @{@"key": @"字典转成data",
@"key1": @"在set、数组、字典中嵌套"};
NSData *dataSetItem = [NSJSONSerialization dataWithJSONObject:dataSet
options:NSJSONWritingPrettyPrinted
error:nil];
NSMutableSet *set = [NSMutableSet setWithArray:@[@"可变集合",
@"字典->不可变集合->可变集合",
dataSetItem]];
NSDictionary *dict = @{@"name" : @"标哥的技术博客",
@"title" : @"http://www.henishuo.com",
@"count" : @(11),
@"dataString" : dataString,
@"results" : [NSSet setWithObjects:@"集合值1", @"集合值2", set , nil],
@"summaries" : @[@"sm1",
@"sm2",
@{@"keysm": @{@"stkey": @"字典->数组->字典->字典"}},
dataSetItem],
@"parameters" : @{@"key1" : @"value1",
@"key2": @{@"key11" : @"value11",
@"key12" : @[@"三层", @"字典->字典->数组"]},
@"key13": dataSetItem},
@"hasBug": @[@"YES",@"NO"],
@"contact" : @[@"关注博客地址:http://www.henishuo.com",
@"QQ群: 324400294",
@"关注微博:标哥Jacky",
@"关注GITHUB:CoderJackyHuang"]};
NSLog(@"%@", dict);
打印效果如下:
2015-12-31 16:47:42.352 demo[58176:2693559] {
hasBug = (
"YES",
"NO",
),
dataString = "我是转换成",
title = "http://www.henishuo.com",
count = 11,
results = {(
"集合值2",
"集合值1",
{(
"可变集合",
"字典->不可变集合->可变集合",
{
key = "字典转成data",
key1 = "在set、数组、字典中嵌套",
},
)},
)},
summaries = (
"sm1",
"sm2",
{
keysm = {
stkey = "字典->数组->字典->字典",
},
},
{
key = "字典转成data",
key1 = "在set、数组、字典中嵌套",
},
),
contact = (
"关注博客地址:http://www.henishuo.com",
"QQ群: 324400294",
"关注微博:标哥Jacky",
"关注GITHUB:CoderJackyHuang",
),
name = "标哥的技术博客",
parameters = {
key1 = "value1",
key13 = {
key = "字典转成data",
key1 = "在set、数组、字典中嵌套",
},
key2 = {
key11 = "value11",
key12 = (
"三层",
"字典->字典->数组",
),
},
},
}
如何使用
首先要得到源代码,安装方式有两种,一种是直接使用Cocoapods
:
pod 'HYBUnicodeReadable', '~> 1.0'
或者直接下载源代码https://github.com/CoderJackyHuang/HYBUnicodeReadable,放入工程中即可
温馨提示:不需要引入头文件,即可达到效果!
写在最后
如果在使用过程中出现任何bug,请反馈作者以便及时修正!谢谢您的支持!
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