Foundation+Log.m

#import <Foundation/Foundation.h>

@implementation NSDictionary (Log)
/**
 *  系统会自动调用
 */
- (NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString *str = [NSMutableString string];
    
    [str appendString:@"{\n"];
    
    // 遍历字典的所有键值对
    [self enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        [str appendFormat:@"\t%@ = %@,\n", key, obj];
    }];
    
    [str appendString:@"}"];
    
    // 查出最后一个,的范围
    NSRange range = [str rangeOfString:@"," options:NSBackwardsSearch];
    // 删掉最后一个,
    [str deleteCharactersInRange:range];
    
    return str;
}
@end

@implementation NSArray (Log)
/**
 *  系统会自动调用
 */
- (NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString *str = [NSMutableString string];
    
    [str appendString:@"[\n"];
    
    // 遍历数组的所有元素
    [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        [str appendFormat:@"%@,\n", obj];
    }];
    
    [str appendString:@"]"];
    
    // 查出最后一个,的范围
    NSRange range = [str rangeOfString:@"," options:NSBackwardsSearch];
    // 删掉最后一个,
    [str deleteCharactersInRange:range];
    
    return str;
}
@end