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我剛學的Objective-C,但無法弄清楚什麼是錯我的代碼無法NSURL對象添加到的NSMutableDictionary
代碼:
NSMutableDictionary *myDic = [NSDictionary dictionary];
[myDic setObject:[NSURL URLWithString:@"http://www.apple.com"] forKey:@"Apple"];
我剛學的Objective-C,但無法弄清楚什麼是錯我的代碼無法NSURL對象添加到的NSMutableDictionary
代碼:
NSMutableDictionary *myDic = [NSDictionary dictionary];
[myDic setObject:[NSURL URLWithString:@"http://www.apple.com"] forKey:@"Apple"];
雖然你聲明NSMutableDictionary
你創建不可變的NSDictionary
對象。
的myDic
正確的聲明和初始化將
NSMutableDictionary *myDic = [NSMutableDictionary dictionary];