替换NSDictionary中的键/值 [英] Replacing key/value in NSDictionary
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问题描述
如果我有一个包含以下键/值"foo"/"bar"的字典,并声明为"[dictionary setObject:@"baz" forKey:@"foo"];
",是否会将当前键值对替换为"foo"/"baz"并删除"foo"/"bar" ?
If I have a dictionary with the following key/value "foo"/"bar" and declared [dictionary setObject:@"baz" forKey:@"foo"];
would this replace the current key value pair with "foo"/"baz" and delete "foo"/"bar"?
推荐答案
NSMutableDictionary (与任何常见哈希表一样)的行为是,如果不存在,它将创建一个新的键/值对,如果已经存在,则将其替换为新值.
The behave of an NSMutableDictionary (as any common hash table) is that if it does not exists it creates a new key/value pair, if it already exits it will replace the existing value with the new one.
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