oc-Foundation_04_NSDictionary_NSMutableDictionary

Foundation_04_NSDictionary_NSMutableDictionary

一、NSDictionary的创建方式

1.1 方式一、+ (id) dictionaryWithObjectsAndKeys:

NSDictionary * array = [NSDictionary dictionaryWithObjectsAndKeys:ob1,@"key1",obj2,@"key2"];

1.2 方式二、字面量语法

二、NSDictionary获取值

2.1 方式一、- (id) objectForKey:

2.2 方式二、array[i]

三、NSMutableDictionary的创建方式

3.1 方式一、向NSMutableDictionary发送一个dictionary消息

NSMutableDictionary * array = [NSMutableDictionary dictionary];

3.2 方式二、使用+(id)dictionaryWithCapacity:(NSUInteger)numItems

NSMutableDictionary * array = [NSMutableDictionary dictionaryWithCapacity:10];

四、NSMutableDictionary操作

4.1 增

- (void)setObject:forKey:
- (void)setObject: forKeyedSubscript:
- (void)setValue: forKey:
- (void)setDictionary:
- (void)addEntriesFromDictionary:

4.2 删

- (void)removeObjectForKey:
- (void)removeObjects
- (void)removeObjectsForKeys: