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获取JSON中所有对象的特定键值

nsmutabledictionary nsmutablearray json objective-c ios

Tulon · 技术社区 · 11 年前

这是我的JSON:

{
"Frames":
[
{"Image":"1.png", "Time":"0.04"},
{"Image":"2.png", "Time":"0.04"},
{"Image":"3.png", "Time":"0.04"},
{"Image":"4.png", "Time":"0.04"},
{"Image":"5.png", "Time":"0.04"},
{"Image":"6.png", "Time":"0.04"},
{"Image":"7.png", "Time":"0.04"},
{"Image":"8.png", "Time":"0.04"},
{"Image":"9.png", "Time":"0.04"},
{"Image":"10.png", "Time":"0.04"},
{"Image":"11.png", "Time":"0.04"},
{"Image":"12.png", "Time":"0.04"},
{"Image":"13.png", "Time":"0.04"},
{"Image":"14.png", "Time":"0.04"},
{"Image":"15.png", "Time":"0.04"},
{"Image":"16.png", "Time":"0.04"},
{"Image":"17.png", "Time":"0.04"},
{"Image":"18.png", "Time":"0.04"},
{"Image":"19.png", "Time":"0.04"},
{"Image":"20.png", "Time":"0.04"}
]
}

我想保存的每个值(这里总共20个) Image 键入一个 NSMutableArray 名称 imageNamesArray 以及 Time 键入另一个 NS可变阵列 名称 durationArray .

我试着用 [dictionary valueForKeyPath:@"Frames.Image"] 如下所示:

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"animation" ofType:@"json"];
NSData *content = [[NSData alloc] initWithContentsOfFile:filePath];

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
dictionary = [NSJSONSerialization JSONObjectWithData:content options:kNilOptions error:nil];
NSMutableDictionary *detailsDictionary = [[NSMutableDictionary alloc] init];


self.imageNamesArray = [[NSMutableArray alloc] init];
self.durationArray = [[NSMutableArray alloc] init];

[self.imageNamesArray addObject:[dictionary valueForKeyPath:@"Frames.Image"]];
[self.durationArray addObject:[dictionary valueForKeyPath:@"Frames.Time"]];

NSLog(@"imageNamesArray %@", [imageNamesArray objectAtIndex:0]);
NSLog(@"durationArray %@", durationArray);

但是,它保存了所有 形象 的第一行中的键值 图像名称阵列 (我的意思是 [imageNamesArray objectAtIndex:0] ). 同样适用于 持续时间阵列 。我该怎么做? 提前非常感谢。

输出将是

imageNamesArray = 1.png, 2.png...........20.PNG
durationArray = 0.04, 0.04...............0.04

2 回复 | 直到 11 年前

kocakmstf 11 年前

您应该使用第一帧对象作为数组并在其中循环。

        NSString *filePath = [[NSBundle mainBundle] pathForResource:@"animation" ofType:@"json"];
        NSData *content = [[NSData alloc] initWithContentsOfFile:filePath];

        NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
        dictionary = [NSJSONSerialization JSONObjectWithData:content options:kNilOptions error:nil];

    //this is your loop array
        NSArrray *objArray=[dictionary objectForKey:@"Frames"];

        NSMutableDictionary *detailsDictionary = [[NSMutableDictionary alloc] init];


        self.imageNamesArray = [[NSMutableArray alloc] init];
        self.durationArray = [[NSMutableArray alloc] init];

        for (NSDictionary *dic in objArray) {
            [self.imageNamesArray addObject:dic[@"Image"]]; 
            [self.durationArray addObject:dic[@"Time"]]; 
       }

        NSLog(@"imageNamesArray %@", [imageNamesArray objectAtIndex:0]);
        NSLog(@"durationArray %@", durationArray);

Bhumeshwer katre 11 年前

你可以通过每个 NSDictionary 并可以将对象添加到相应的数组中。

for (NSDictionary *dict in dictionary[@"Frames"]) {
    [_imageNamesArray addObject:dict[@"Image"]];
    [_durationArray addObject:dict[@"Time"]];
}
NSLog(@"imageNamesArray %@--%ld", _imageNamesArray, _imageNamesArray.count);
NSLog(@"durationArray %@--%ld", _durationArray, _durationArray.count);