我正在用Swift重写一个Objective-C类，以感受一下这门语言。在Objective-C中，我的类包含以下方法:-(id)initWithCoder:(NSCoder*)aDecoder{return[selfinitWithActionName:[aDecoderdecodeObjectOfClass:[NSStringclass]forKey:@"actionName"]payload:[aDecoderdecodeObjectOfClass:[NSDictionaryclass]forKey:@"payload"]timestamp:[aDecoderdecodeObje
我有一个泛型类，我希望它能够与默认类型一起使用。现在我可以用任何类型初始化它，但我必须明确。//InitializewithatypeMyManager()//InitializewithNSObject(whatIwanttobemydefaulttype)MyManager()//Thisdoesn'twork,butIwantthiskindoffunctionalityclassMyManager{}//SoIcancreatemymanagerlikesoanditinsertsthedefaulttypeasNSObjectMyManager()//OrMyManager(
我有一个泛型类，我希望它能够与默认类型一起使用。现在我可以用任何类型初始化它，但我必须明确。//InitializewithatypeMyManager()//InitializewithNSObject(whatIwanttobemydefaulttype)MyManager()//Thisdoesn'twork,butIwantthiskindoffunctionalityclassMyManager{}//SoIcancreatemymanagerlikesoanditinsertsthedefaulttypeasNSObjectMyManager()//OrMyManager(
如果我使用下面的代码，它会显示错误“类型‘HttpConnection’不符合协议(protocol)‘NSObjectProtocol’”classHttpConnection:NSURLConnectionDataDelegate{varurlConnection:NSURLConnection?weakvardelegate:HttpConnecting?init(delegate:HttpConnecting){self.delegate=delegate;}funcstartAsynRequestWithUrlString(url:NSString,withMethod:NS
如果我使用下面的代码，它会显示错误“类型‘HttpConnection’不符合协议(protocol)‘NSObjectProtocol’”classHttpConnection:NSURLConnectionDataDelegate{varurlConnection:NSURLConnection?weakvardelegate:HttpConnecting?init(delegate:HttpConnecting){self.delegate=delegate;}funcstartAsynRequestWithUrlString(url:NSString,withMethod:NS
Swift中的Hashable协议(protocol)要求您实现一个名为hashValue的属性:protocolHashable:Equatable{///Returnsthehashvalue.Thehashvalueisnotguaranteedtobestable///acrossdifferentinvocationsofthesameprogram.Donotpersistthehash///valueacrossprogramruns.//////Thevalueof`hashValue`propertymustbeconsistentwiththeequality///
Swift中的Hashable协议(protocol)要求您实现一个名为hashValue的属性:protocolHashable:Equatable{///Returnsthehashvalue.Thehashvalueisnotguaranteedtobestable///acrossdifferentinvocationsofthesameprogram.Donotpersistthehash///valueacrossprogramruns.//////Thevalueof`hashValue`propertymustbeconsistentwiththeequality///
当键盘显示在屏幕上时，我使用下面的几行代码来获取键盘的框架。我已经注册了UIKeyboardDidShowNotification通知。funckeyboardWasShown(notification:NSNotification){varinfo=notification.userInfovarkeyboardFrame:CGRect=info.objectForKey(UIKeyboardFrameEndUserInfoKey).CGRectValue()}这曾经在beta5中工作。我下载了最新的Xcode6版本，它是beta6，这个错误发生在第二行。'[NSObject:Any
当键盘显示在屏幕上时，我使用下面的几行代码来获取键盘的框架。我已经注册了UIKeyboardDidShowNotification通知。funckeyboardWasShown(notification:NSNotification){varinfo=notification.userInfovarkeyboardFrame:CGRect=info.objectForKey(UIKeyboardFrameEndUserInfoKey).CGRectValue()}这曾经在beta5中工作。我下载了最新的Xcode6版本，它是beta6，这个错误发生在第二行。'[NSObject:Any
在Objective-C中，可以在类中添加一个description方法来帮助调试:@implementationMyClass-(NSString*)description{return[NSStringstringWithFormat:@"",[selfclass],foo_foo];}@end然后在调试器中，您可以:pofooClassSwift中的等价物是什么？Swift的REPL输出可能会有所帮助:1>classMyClass{letfoo=42}2>3>letx=MyClass()x:MyClass={foo=42}但我想覆盖此行为以打印到控制台:4>println("x=
