How to get key/value pair from NSDictionary?

Question

I need little help with NSDictionary. How can I get 1 pair, lets say a value for "id" if I have dictionary

NSDictionary *allCourses = [NSJSONSerialization JSONObjectWithData:allCoursesData options:NSJSONReadingMutableContainers error:&error];

and it looks like this:

Thanks for Your help.

Answer 1

最短的方式：

NSNumber *number = allCourses[@"semacko"][@"id"];

Answer 2

Try this:

NSDictionary *allCourses = [NSJSONSerialization JSONObjectWithData:allCoursesData options:NSJSONReadingMutableContainers error:&error];
        [allCourses enumerateKeysAndObjectsUsingBlock: ^(id key, id obj, BOOL *stop) {
    // do something with key and obj
}];

Answer 3

NSDictionary *semacko = [allCourses objectForKey:@"semacko"];
NSNumber *number = [semacko objectForKey:@"id"];

Answer 4

NSNumber *number = allCourses[@"semacko"][@"id"];

or if you want to iterate all objects:

for(NSDictionary* course in allCourses) {
    NSNumber *number = course[@"id"];
}

Answer 5

NSString *name =[[NSString alloc]initWithFormat:@"%@",[Dictionaryname objectForKey:@"key"]];

通过此代码，您可以访问与objectforkey关键字中指定的键对应的值

Answer 6

You can try:

NSNumber *courseID = [allCourses valueForKeyPath:@"semacko.id"];

For setting value:

- setValue:forKeyPath: