将JSON数据的NSString转换为NSArray [英] Converting an NSString of JSON Data to NSArray

问题描述

我有一个 NSString ，它以的形式存储 JSON 数组的NSString 。名为 colorArray 的 NSString 的值为：

I have an NSString that is storing a JSON array in the form of a NSString. The NSString called colorArray has the value of:

[{ "color":"Red" },{ "color":"Blue" },{ "color":"Yellow"}];

我还有一个tableview，我想导入数组以填充表格。如果我将 tableData 加载到如下所示的数组中，该表有效，但我无法弄清楚如何转换 NSString 进入一个可用于填充 tableData 的数组，如下所示......

I also have a tableview that I would like to import the array into in order to populate the table. The table works if I load the tableData into an array like below, but I can't figure out how to convert the NSString into an array that can be used to populate the tableData like shown below...

任何人都有想法？非常感谢！

Anyone have ideas? Thanks much!

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Initialize table data
    tableData = [NSArray arrayWithObjects:@"Red", @"Blue", @"Yellow", nil];
}

推荐答案

// Your JSON data:
NSString *colorArray = @"[{ \"color\":\"Red\" },{ \"color\":\"Blue\" },{ \"color\":\"Yellow\"}]";
NSLog(@"colorArray=%@", colorArray);

// Convert to JSON object:
NSArray *jsonObject = [NSJSONSerialization JSONObjectWithData:[colorArray dataUsingEncoding:NSUTF8StringEncoding]
                                                      options:0 error:NULL];
NSLog(@"jsonObject=%@", jsonObject);

// Extract "color" values:
NSArray *tableData = [jsonObject valueForKey:@"color"];
NSLog(@"tableData=%@", tableData);

输出：

colorArray=[{ "color":"Red" },{ "color":"Blue" },{ "color":"Yellow"}]
jsonObject=(
        {
        color = Red;
    },
        {
        color = Blue;
    },
        {
        color = Yellow;
    }
)
tableData=(
    Red,
    Blue,
    Yellow
)

最后一步使用的特殊功能 - [NSArray valueForKey：]
返回一个包含调用 valueForKey：使用每个数组对象上的键。

The last step uses the special feature of -[NSArray valueForKey:] that returns an array containing the results of invoking valueForKey: using the key on each of the array's objects.

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