NSMutableDictionary选择器setObject forkey错误

Question

这是我的代码

NSMutableDictionary* stations = [[NSMutableDictionary alloc] init];
RadioStation* newStation;
newStation = [[RadioStation alloc]
initWithName:@"Star 94 fm" atfrequency:91.4];
[stations setObject:newStation forkey:@"WSTR"];

但我一直收到错误："no visible @interface" for NSMutableDictionary declares the selector setObject forkey

任何帮助将不胜感激。

Answer 1

正确的选择器是setObject:forKey:，而不是setObject:forkey:。