小编Fra*_*s F的帖子

我正在使用10.12.6的hackintosh版本,我已经有Xcode 8.3.3,它工作正常.今天我安装了Xcode 9 beta 4,当我尝试运行它时,模拟器给我一个空白的屏幕,下面的图像有奇怪的图形,它永远保持这样.

我根据其他论坛尝试的事情

1.Reinstall the Xcode beta
2.`rm -rf ~/Library/Developer/Xcode/DerivedData`
3.Open Xcode and delete all the simulators using the Window > Devices window
4.Take a backup of `~/Library/Developer/CoreSimulator/Devices/device_set.plist` and then remove the `com.apple.CoreSimulator.SimRuntime.iOS-9-0` key. 
5.Reinstall simulators within Xcode using the + in the lower-left of Window > Devices.

我还删除了我的Xcode 8.3.3只是为了确保它不会产生任何冲突,但仍然没有运气.任何帮助表示赞赏

使用 IQKeyboardManagerSwift 时，我无法在工具栏中看到下一个/上一个按钮，当它的内部堆栈视图我检查了这个链接并将 IQPreviousNextView 添加为我的视图类时。但仍然面临同样的问题。下面是我的故事板布局。

任何帮助表示赞赏

我正在尝试进行共享操作,其中我使用异步块调用函数,但在我的下一个if语句中,我需要获取在块中完成的值以继续.这是我的代码,它将突出更多细节.我听说过NSLock并尝试使用它,但它没有用,可能是我做了锁定,我对锁不太熟悉.

-(void) shareOperation
{
__block NSString *resultText;
BOOL continueSharing;
 NSLock *conditionLock=[[NSLock alloc] init];
         dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
        dispatch_async(queue, ^{
            [conditionLock lock];
        [self performSomeAsynchronousOperation completionBlock:^(NSError *tError, bool status)
         {
             dispatch_async(dispatch_get_main_queue(),
                            ^{

                                if (status)
                                {
                                    resultText = @"Operation completed. Would you like to continue?";

                                }
                                else
                                {
                                    resultText = @" Operation failed. Would you still like to continue?";
                                }
                                UIAlertView *result = [UIAlertView alertViewWithTitle:nil message:resultText cancelButtonTitle:@"Cancel" otherButtonTitles:[NSArray arrayWithObjects:@"OK",nil] onDismiss:^(int buttonIndex)
                                                       {
                                                           NSLog(@"selected button index: %d",buttonIndex);
                                                           if (buttonIndex == 0)
                                                           {
                                                               continueSharing=YES; …

在我的 macOS 应用程序中，我尝试使用以下扩展名创建一个目录

extension URL {\n    static func createFolder(folderName: String, folderPath:URL) -> URL? {\n        let fileManager = FileManager.default\n        let folderURL = folderPath.appendingPathComponent(folderName)\n        // If folder URL does not exist, create it\n        if !fileManager.fileExists(atPath: folderURL.path) {\n            do {\n                // Attempt to create folder\n                // try fileManager.createDirectory(at: folderURL, withIntermediateDirectories: true, attributes: nil)\n                // try fileManager.createDirectory(atPath: folderURL.path, withIntermediateDirectories: true, attributes: nil)\n                try fileManager.createDirectory(atPath: folderURL.relativePath, withIntermediateDirectories: true, attributes: nil)\n            } catch {\n                print(error.localizedDescription + ":\\(folderURL.path)")\n                return nil\n            }\n        }\n        return folderURL\n    }\n}\n

我想在字符'='后过滤字符串.例如,如果8 + 9 = 17我的输出应为17.我可以使用NSScanner在'='之前过滤字符,如何进行反向??? 我需要一种有效的方法来实现这一点,而无需使用componentsSeparatedByString或创建数组