Objective-C Foundation架構實踐——NSMutableDictionary（一）__foundation

     字典也可以是可變的。常見的可變字典的方法如下：

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {  @autoreleasepool {        NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];        //添加索引值對    [dict setObject:@"a" forKey:@"1"];    [dict setObject:@"b" forKey:@"2"];    [dict setObject:@"c" forKey:@"3"];        NSLog(@"%@",dict);                //刪除索引值對        //刪除所有對象；//    [dict removeAllObjects];//    [dict removeObjectForKey:@"2"];  }    return 0;}

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