NSLog打印查年数组字典对象的中文信息

水深无声 2022-02-18 15:05 212阅读 0赞

使用NSLog查看信息时，如果是NSArray、NSDictionary、NSObject的对象时，无法查看到详细的信息，特别是中文时，无法正常显示，这时候需要进行特殊设置。  
1、对于NSArray、NSDictionary时，需要创建分类，并重写方法`- (NSString *)descriptionWithLocale:(id)locale`实现；  
2、对于NSObject时，需要创建分类，重写方法`- (NSString *)description`实现。

实现代码

# NSArray #

#import <Foundation/Foundation.h>
    
    NS_ASSUME_NONNULL_BEGIN
    
    @interface NSArray (Category)
    
    @end
    
    NS_ASSUME_NONNULL_END
    
    #import "NSArray+Category.h"
    
    @implementation NSArray (Category)
    
    - (NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level
    {
        NSMutableString *str = [NSMutableString stringWithString:@"(\n"];
        [self enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            [str appendFormat:@"\t%@,\n", obj];
        }];
        [str appendString:@")"];
        return str;
    }
    
    @end

### 结果 ###

NSArray *array = @[@"张三", @"李四", @"wangWu", @"小明"];
    NSLog(@"array: %@", array);
    
    2019-04-17 17:40:27.706032+0800 DemoLog[20566:576588] array: (
    	张三,
    	李四,
    	wangWu,
    	小明,
    )

# NSDictionary #

#import <Foundation/Foundation.h>
    
    NS_ASSUME_NONNULL_BEGIN
    
    @interface NSDictionary (Category)
    
    @end
    
    NS_ASSUME_NONNULL_END
    
    
    #import "NSDictionary+Category.h"
    
    @implementation NSDictionary (Category)
    
    - (NSString *)descriptionWithLocale:(id)locale indent:(NSUInteger)level
    {
        NSMutableString *str = [NSMutableString stringWithString:@"{\n"];
        [self enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
            [str appendFormat:@"\t%@ = %@;\n", key, obj];
        }];
        [str appendString:@"}"];
        return str;
    }
    
    @end

### 结果 ###

NSDictionary *dict = @{@"姓名":@"张三", @"职业":@"农二代", @"年龄":@(30), @"company":@"个体"};
    NSLog(@"dict: %@", dict);
        
    2019-04-17 17:40:27.706222+0800 DemoLog[20566:576588] dict: {
    	姓名 = 张三;
    	职业 = 农二代;
    	年龄 = 30;
    	company = 个体;
    }

# NSObject #

#import <Foundation/Foundation.h>
    
    NS_ASSUME_NONNULL_BEGIN
    
    @interface NSObject (Category)
    
    @end
    
    NS_ASSUME_NONNULL_END
    
    
    #import "NSObject+Category.h"
    #import <objc/runtime.h>
    
    @implementation NSObject (Category)
    
    - (NSString *)description
    {
        NSString *desc = @"\n{";
        //
        unsigned int outCount;
        objc_property_t *properties = class_copyPropertyList([self class], &outCount);
        for (int i = 0; i < outCount; i ++) {
            objc_property_t property = properties[i];
            //获取property的C字符串
            const char * propName = property_getName(property);
            if (propName) {
                //获取NSString类型的property名字
                NSString *prop = [NSString stringWithCString:propName encoding:[NSString defaultCStringEncoding]];
                //获取property对应的值
                id obj = [self valueForKey:prop];
                //将属性名和属性值拼接起来
                desc = [desc stringByAppendingFormat:@"%@: %@,\n",prop,obj];
            }
        }
        desc = [desc stringByAppendingFormat:@"}\n"];
        free(properties);
        
        return desc;
    }
    
    @end

### 结果 ###

Person *person = [[Person alloc] init];
    person.name = @"小明";
    person.job = @"研发工程师";
    person.age = @"28";
    person.company = @"BYD Auto";
    person.project = @[@"project1", @"王者荣耀", @"跑跑卡丁车", @"逃离神庙", @"吃鸡"];
    person.learn = @{@"开发":@"Objective-C", @"project":@(10), @"team":@[@"张三", @"李四", @"wangWu", @"小明"]};
    NSLog(@"person: %@", person);
    
    2019-04-17 17:40:27.706527+0800 DemoLog[20566:576588] person: 
    {name: 小明,
    age: 28,
    job: 研发工程师,
    company: BYD Auto,
    project: (
    	project1,
    	王者荣耀,
    	跑跑卡丁车,
    	逃离神庙,
    	吃鸡,
    ),
    learn: {
    	project = 10;
    	team = (
    	张三,
    	李四,
    	wangWu,
    	小明,
    );
    	开发 = Objective-C;
    },
    }