How to Use nsmutabledictionary

The dictionary and the array and string also have a variable subclass, but the method names involved are different, but the principles are similar.

 

Methods involved:

Removeobjectforkey:Delete a specified key-Value Pair (PS: only the key is entered here. The key and value are deleted, but nothing happens to the input value ).

 

Let's take a look at the example below:

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {    @autoreleasepool {        NSMutableDictionary *dicti = [NSMutableDictionary new];        [dicti setObject:@"Five" forKey:@"5"];        [dicti setObject:@"Four" forKey:@"4"]; //添加指定的键值对//        [dicti setObject:@"Five" forKey:@"5"];        //添加键值对和删除键值对的时候没有说是插入到哪里, 和删除哪一个, 因为字典中的键值对是不讲究位置的.        NSLog(@"dicti = %@", dicti);                        //removeObjectForKey:删除对应的键值对.        //删除键值对也是同样不将就顺序.//        [dicti removeObjectForKey:@"4"];        [dicti removeObjectForKey:@"5"];        NSLog(@"diciti = %@", dicti);                [dicti release];    }    return 0;}

Output result:

2014-10-13 21:16:31.843 NSMutableDictionary[6749:303] dicti = {    4 = Four;    5 = Five;}2014-10-13 21:16:31.844 NSMutableDictionary[6749:303] diciti = {    4 = Four;}Program ended with exit code: 0

 

How to Use nsmutabledictionary