NSString,NSArray和NSDictionary to JSON标准格式字符串

最新推荐文章于 2022-01-19 19:30:00 发布

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本文介绍了一种使用Objective-C实现JSON序列化的实用方法。通过自定义类别扩展NSString类，实现了不同类型对象到JSON字符串的转换，包括处理字符串、字典、数组等复杂数据结构。

#import <Foundation/Foundation.h>

@interface NSString (HXAddtions)

+(NSString *) jsonStringWithDictionary:(NSDictionary *)dictionary;

+(NSString *) jsonStringWithArray:(NSArray *)array;

+(NSString *) jsonStringWithString:(NSString *) string;

+(NSString *) jsonStringWithObject:(id) object;

+(void) jsonTest;

@end

#import "NSString+HXAddtions.h"

@implementation NSString (HXAddtions)

+(void)jsonTest{
    //test
    
    NSDictionary *dictionary1 = [NSDictionary dictionaryWithObjectsAndKeys:
                                 @"阿三\"\n11",@"name",
                                 @"18",@"age",
                                 nil];
    NSDictionary *dictionary2 = [NSDictionary dictionaryWithObjectsAndKeys:
                                 @"阿四",@"name",
                                 @"20",@"age",
                                 nil];
    
    NSArray *array = [NSArray arrayWithObjects:dictionary1,dictionary2, nil];
    
    
    NSDictionary *dictionary3 = [NSDictionary dictionaryWithObjectsAndKeys:
                                 @"李\na",@"name",
                                 @"29",@"age",
                                 nil];
    
    NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"string",@"string",
                                array,@"array",
                                dictionary3,@"dictionary",
                                nil];
    NSLog(@"dictionary:%@",dictionary);
    NSString *jsonString = [NSString jsonStringWithObject:dictionary];
    NSLog(@"dictionary jsonString:%@",jsonString);
    
    NSLog(@"%@",[NSDictionary dictionaryWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding]]);
    
}
+(NSString *) jsonStringWithString:(NSString *) string{
    return [NSString stringWithFormat:@"\"%@\"",
                            [[string stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"] stringByReplacingOccurrencesOfString:@"\""withString:@"\\\""]
                          ];
}
+(NSString *) jsonStringWithArray:(NSArray *)array{
    NSMutableString *reString = [NSMutableString string];
    [reString appendString:@"["];
     NSMutableArray *values = [NSMutableArray array];
    for (id valueObj in array) {
        NSString *value = [NSString jsonStringWithObject:valueObj];
        if (value) {
            [values addObject:[NSString stringWithFormat:@"%@",value]];
        }
    }
    [reString appendFormat:@"%@",[values componentsJoinedByString:@","]];
    [reString appendString:@"]"]; 
    return reString;
}
+(NSString *) jsonStringWithDictionary:(NSDictionary *)dictionary{
    NSArray *keys = [dictionary allKeys];
    NSMutableString *reString = [NSMutableString string];
    [reString appendString:@"{"];
    NSMutableArray *keyValues = [NSMutableArray array];
    for (int i=0; i<[keys count]; i++) {
        NSString *name = [keys objectAtIndex:i];
        id valueObj = [dictionary objectForKey:name];
        NSString *value = [NSString jsonStringWithObject:valueObj];
        if (value) {
            [keyValues addObject:[NSString stringWithFormat:@"\"%@\":%@",name,value]];
        }
    }
    [reString appendFormat:@"%@",[keyValues componentsJoinedByString:@","]];
    [reString appendString:@"}"];
    return reString;
}
+(NSString *) jsonStringWithObject:(id) object{
    NSString *value = nil;
    if (!object) {
        return value;
    }
    if ([object isKindOfClass:[NSString class]]) {
        value = [NSString jsonStringWithString:object];
    }else if([object isKindOfClass:[NSDictionary class]]){
        value = [NSString jsonStringWithDictionary:object];
    }else if([object isKindOfClass:[NSArray class]]){
        value = [NSString jsonStringWithArray:object];
    }
    return value;
}
@end