Question

我的json文件如下所示：

{
  "images": [
  "straight up kick.png",
  "women kick.png",
  "Taekwondo Kanji vertical.png",
  "face kick3.png",
  "flexibility.png",
  "Punch.png",
  "hook kick.png",
  "front kick 2.png"
 ]
}

我正在以编程方式阅读上面的json，如下所示：

NSString *path = [[NSBundle mainBundle] pathForResource:@"generated" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:path];
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

NSMutableArray * jsonimages = [dict objectForKey:@"images"];
NSLog(@"images %@", jsonimages);

我希望通过以编程方式写入json文件，将更多项添加到名为jsonimages的数组中。 Json文件名是generated.json。

任何帮助都将不胜感激。

Answer 1

- (void)writeStringToFile:(NSString*)aString {

    // Build the path, and create if needed.
    NSString* filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString* fileName = @"generated.json";
    NSString* fileAtPath = [filePath stringByAppendingPathComponent:fileName];

    if (![[NSFileManager defaultManager] fileExistsAtPath:fileAtPath]) {
        [[NSFileManager defaultManager] createFileAtPath:fileAtPath contents:nil attributes:nil];
    }

    // The main act...
    [[aString dataUsingEncoding:NSUTF8StringEncoding] writeToFile:fileAtPath atomically:NO];
}

- (NSString*)readStringFromFile {

    // Build the path...
    NSString* filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString* fileName = @"generated.json";
    NSString* fileAtPath = [filePath stringByAppendingPathComponent:fileName];

    // The main act...
    return [[NSString alloc] initWithData:[NSData dataWithContentsOfFile:fileAtPath] encoding:NSUTF8StringEncoding];
}

iOS：以编程方式将数据写入json文件

1 个答案: