importFoundationimportMobileCoreServicesfunccheckFileExtension(fileName:NSString){println(fileName)varfileExtension:CFStringRef=fileName.pathExtensionprintln(fileExtension)varfileUTI:CFStringRef=UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension,fileExtension,nil)println(fileUTI)
我需要在我的iPad应用程序中绘制一些图表，所以我遵循了本教程:http://recycled-parts.blogspot.com/2011/07/setting-up-coreplot-in-xcode-4.html其中我不得不将我的C/C++/Objective-C编译器更改为LLVMGCC4.2。(最初是AppleLLVMCompiler3.0)。现在，我无法将CFStringRef_bridge转换为NSString。我收到以下错误:'_bridge'undeclared(firstuseinafunction)谁能帮我解决这个问题？？谢谢。 最佳
将Objective-C程序转换为Objective-CARC时，出现错误:"castofObjective-Cpointertype'NSString*'toCpointertype'CFStringRef'(aka'conststruct__CFString*')requiresabridgedcast"代码如下:-(NSString*)_encodeString:(NSString*)string{NSString*result=(NSString*)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)string,
我正在尝试实现CFDictionaryGetValue()，如thisappledoc中所示list3:server=CFDictionaryGetValue(credentialDict,kSecAttrServer);userName=CFDictionaryGetValue(credentialDict,kSecAttrAccount);password=CFDictionaryGetValue(credentialDict,kSecSharedPassword);我是这样实现的letuserName=CFDictionaryGetValue(credentialDict,kSe
在Swift中我如何转换CFStringRef[]和CFTypeRef[]至CMutablePointer？我想调用CFDictionaryCreate来自swift。我已经定义:varkeys:CFStringRef[]=[kCGImageSourceCreateThumbnailWithTransform,kCGImageSourceCreateThumbnailFromImageIfAbsent,kCGImageSourceThumbnailMaxPixelSize,kCGImageSourceCreateThumbnailFromImageAlways]varvalues:CF
我想了解从ARC中的CFStringRef获取NSString的正确方法？反方向也一样，ARC中的CFStringRef到NSString？在不造成内存泄漏的情况下，正确的方法是什么？ 最佳答案 通常NSString*yourFriendlyNSString=(__bridgeNSString*)yourFriendlyCFString;和CFStringRefyourFriendlyCFString=(__bridgeCFStringRef)yourFriendlyNSString;现在，如果你想知道为什么会有__bridge关键
将Objective-C程序转换为Objective-CARC时，出现错误:"castofObjective-Cpointertype'NSString*'toCpointertype'CFStringRef'(aka'conststruct__CFString*')requiresabridgedcast"代码如下:-(NSString*)_encodeString:(NSString*)string{NSString*result=(NSString*)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)string,
将Objective-C程序转换为Objective-CARC时，出现错误:"castofObjective-Cpointertype'NSString*'toCpointertype'CFStringRef'(aka'conststruct__CFString*')requiresabridgedcast"代码如下:-(NSString*)_encodeString:(NSString*)string{NSString*result=(NSString*)CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)string,
