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Homephp教程php手册ios json(将字典或者数组转化为JSON串)

一、将NSDictionary或NSArray转化为JSON串 // 将字典或者数组转化为JSON串 - (NSData *)toJSONData:(id)theData{ NSError *error = nil; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData options:NSJSONWritingPrettyPrinted error: if

一、将NSDictionary或NSArray转化为JSON串

// 将字典或者数组转化为JSON串

- (NSData *)toJSONData:(id)theData{



NSError *error = nil;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData

options:NSJSONWritingPrettyPrinted

error:&error];



if ([jsonData length] > 0 && error == nil){

        return jsonData;

    }else{

        return nil;

    }

}

使用这个方法的返回,我们就可以得到想要的JSON串

NSString *jsonString = [[NSString alloc] initWithData:jsonData

                                                 encoding:NSUTF8StringEncoding];


二、将JSON串转化为NSDictionary或NSArray

将NSString转化为NSData

[jsonString dataUsingEncoding:NSASCIIStringEncoding];



// 将JSON串转化为字典或者数组

- (id)toArrayOrNSDictionary:(NSData *)jsonData{

    NSError *error = nil;

    id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData

                                                    options:NSJSONReadingAllowFragments

                                                      error:&error];

    

    if (jsonObject != nil && error == nil){

        return jsonObject;

    }else{

        // 解析错误

         return nil;

    }


}

三、将JSON串与NSArray和NSDictionary的操作进行封装

当然,也有很多时候,我们将这些操作,分别定义在NSObject和NSString的一个分类中

直接贴:

1.将NSString转化为NSArray或者NSDictionary

#import "NSString+JSONCategories.h"


@implementation NSString(JSONCategories)


-(id)JSONValue;

{

    NSData* data = [self dataUsingEncoding:NSUTF8StringEncoding];

    __autoreleasing NSError* error = nil;

    id result = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

    if (error != nil) return nil;

    return result;

}

@end


2.将NSArray或者NSDictionary转化为NSString

#import "NSObject+JSONCategories.h"


@implementation NSObject (JSONCategories)


-(NSData*)JSONString;

{

    NSError* error = nil;

    id result = [NSJSONSerialization dataWithJSONObject:self

                                                options:kNilOptions error:&error];

    if (error != nil) return nil;

    return result;

}

@end
 一、将NSDictionary或NSArray转化为JSON串

// 将字典或者数组转化为JSON串

- (NSData *)toJSONData:(id)theData{

    

    NSError *error = nil;

    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData

                                                      options:NSJSONWritingPrettyPrinted

                                                         error:&error];

    

    if ([jsonData length] > 0 && error == nil){

        return jsonData;

    }else{

        return nil;

    }

}

使用这个方法的返回,我们就可以得到想要的JSON串

NSString *jsonString = [[NSString alloc] initWithData:jsonData

                                                 encoding:NSUTF8StringEncoding];


二、将JSON串转化为NSDictionary或NSArray

将NSString转化为NSData

[jsonString dataUsingEncoding:NSASCIIStringEncoding];



// 将JSON串转化为字典或者数组

- (id)toArrayOrNSDictionary:(NSData *)jsonData{

    NSError *error = nil;

    id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData

                                                    options:NSJSONReadingAllowFragments

                                                      error:&error];

    

    if (jsonObject != nil && error == nil){

        return jsonObject;

    }else{

        // 解析错误

         return nil;

    }


}

三、将JSON串与NSArray和NSDictionary的操作进行封装

当然,也有很多时候,我们将这些操作,分别定义在NSObject和NSString的一个分类中

直接贴:

1.将NSString转化为NSArray或者NSDictionary

#import "NSString+JSONCategories.h"


@implementation NSString(JSONCategories)


-(id)JSONValue;

{

    NSData* data = [self dataUsingEncoding:NSUTF8StringEncoding];

    __autoreleasing NSError* error = nil;

    id result = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

    if (error != nil) return nil;

    return result;

}

@end


2.将NSArray或者NSDictionary转化为NSString

#import "NSObject+JSONCategories.h"


@implementation NSObject (JSONCategories)


-(NSData*)JSONString;

{

    NSError* error = nil;

    id result = [NSJSONSerialization dataWithJSONObject:self

                                                options:kNilOptions error:&error];

    if (error != nil) return nil;

    return result;

}

@end
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