NSDictionary和NSMutableDictionary的用法

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本文介绍了如何使用Objective-C创建和操作字典，包括创建不可变字典和可变字典的方法，并演示了如何添加、删除字典项。

NSDictionary


/*------------------------------------创建字典 ------------------------------------*/
//- (id) initWithObjectsAndKeys;

//NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSString *string = [dictionary objectForKey"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
[dictionary release];



NSMutableDictionary


/*------------------------------------创建可变字典 ------------------------------------*/
//创建
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];

//添加字典
[dictionary setObject"One" forKey"1"];
[dictionary setObject:@"Two" forKey:@"2"];
[dictionary setObject:@"Three" forKey:@"3"];
[dictionary setObject:@"Four" forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);

//删除指定的字典
[dictionary removeObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);