iphone - 将NSDictionary转换为NSMutableDicitonary时，如何影响更改？

我有一个NSDicitonary，并将其转换为NSMutableDictionary。我正在尝试对NSMutableDictionary进行更改，现在即使在NSDictionary中也如何实现这些更改？

NSDictionary *dct=[[NSDictionary alloc] initWithObjectsAndKeys:@"varun",@"name",@"9703507750",@"mobileNo",nil];

NSLog(@"dct : %@",dct);
dctMute=[[NSMutableDictionary alloc] init];

dctMute=[dct mutableCopy];
NSLog(@"dctMute :  %@",dctMute);

[dctMute setObject:@"hyderabad" forKey:@"city"];
[dctMute setObject:@"varun kumar" forKey:@"name"];
NSLog(@"dctMute after adding city:  %@",dctMute);

最佳答案

您不需要可变的副本。创建一个可变的字典，然后使其不变，如下所示:

NSMutableDictionary *dctMute = [NSMutableDictionary dictionary];
dctMute[@"foo"] = @"bar";
NSDictionary *immutableDictionary = [NSDictionary dictionaryWithDictionary:dctMute];

使用新语法，您也可以通过以下方式初始化:

NSDictionary *immutableDictionary = @{@"foo": @"bar"};

关于iphone - 将NSDictionary转换为NSMutableDicitonary时，如何影响更改？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18593976/