小编Shi*_*thi的帖子

我检查了我的配置文件,一切都很好,因为我在firebase提供的演示中使用了配置文件,我正在接收来自该演示项目的推送通知.问题是在我使用的主要项目中:

• 与演示项目相同的代码.
• 相同的配置文件.
• 相同的.plist文件.
• 具有相同版本的相同pod.

我仍然无法在我的项目中收到推送通知.让我知道我在哪里错过了什么.

我正在进行三个 api 调用，并希望 API1 应首先执行，完成后应执行 API2，然后执行 API3。我为此使用了操作队列，并添加了对操作的依赖性。我也尝试设置优先级，但没有按顺序获取 api 调用。帮我看看如何正确制作。

代码是这样的：

let op1 = Operation()
op1.completionBlock = {
    self.APICall(urlString: self.url1)
}
op1.queuePriority = .veryHigh

let op2 = Operation()
op2.completionBlock = {
    self.APICall(urlString: self.url2)
}
op2.queuePriority = .high

let op3 = Operation()
op3.completionBlock = {
    self.APICall(urlString: self.url3)
}

op3.queuePriority = .normal

op2.addDependency(op1)
op3.addDependency(op2)

queue.addOperations([op1, op2, op3], waitUntilFinished: false)

我将 API 调用方法放在 DispatchQueue.main.sync 中，如下所示：

func APICall(urlString: String) {

    let headers: HTTPHeaders = [
        "Accept": "text/html"
    ]
    print(urlString)
    DispatchQueue.main.sync {

        Alamofire.request(urlString.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)!, method: .get, …

我想ViewController在 Swift 4 中呈现一个as popover，但它Viewcontroller通常呈现，这是代码：

class CustomTabBarController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let favViewController = TrialViewController()
        let exhibtionViewController = TrialViewController()
        let menuViewController = ttttViewController()
        let notificationViewController = TrialViewController()
        let profileViewController = ttttViewController()

        favViewController.tabBarItem.title = "first"
        exhibtionViewController.tabBarItem.title = "second"
        menuViewController.tabBarItem.title = "third"
        notificationViewController.tabBarItem.title = "forth"
        profileViewController.tabBarItem.title = "fifth"

        favViewController.tabBarItem.image = UIImage(named:"home25")
        exhibtionViewController.tabBarItem.image = UIImage(named: "bag25")
        menuViewController.tabBarItem.image = UIImage(named: "main_add_25")
        notificationViewController.tabBarItem.image = UIImage(named: "notification25")
        profileViewController.tabBarItem.image = UIImage(named: "man_man25")


        let tabBarItemWidth = Int(self.tabBar.frame.size.width) / (self.tabBar.items?.count)!
        let x …

如何仅设置 UILabel 文本属性一次，然后仅更改文本（字符串）

mTextValue.attributedText = NSAttributedString(string: "STRING", 
       attributes: 
           [NSAttributedStringKey.strokeWidth: -3.0,      
            NSAttributedStringKey.strokeColor: UIColor.black])


mTextValue.text = "NEW STRING" // won't change anything

或者要设置新字符串，我必须一次又一次地NSAttributedString设置吗？.attributedText

根据 Place Autocomplete 文档，预测数组的对象没有位置信息。那么我应该如何获取经度和纬度的详细信息。下面是我的代码 -

extension ViewController: GMSAutocompleteFetcherDelegate {


func didAutocomplete(with predictions: [GMSAutocompletePrediction]) {

    tableData.removeAll()

    for prediction in predictions{

        tableData.append(prediction.attributedFullText.string)

    }
    locationTable.reloadData()
}

func didFailAutocompleteWithError(_ error: Error) {
    print(error.localizedDescription)
}

我正在尝试在UserDefaults中存储字典,并且在代码运行时总是让应用程序崩溃.以下是在执行应用程序时崩溃应用程序的示例代码.我试图将它作为NSDictionary投射或最初使其成为NSDictionary - 得到相同的结果.

class CourseVC: UIViewController {

let test = [1:"me"]

override func viewDidLoad() {
    super.viewDidLoad()

    defaults.set(test, forKey: "dict1")

    }

}

我正在尝试裁剪 NSImage 的选定部分，该部分按照 ProportionallyUpOrDown(AspectFill) 模式安装。我正在使用鼠标拖动事件绘制一个框架，如下所示：

class CropImageView: NSImageView {

    var startPoint: NSPoint!
    var shapeLayer: CAShapeLayer!
    var flagCheck = false
    var finalPoint: NSPoint!

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
    }
    
    override var image: NSImage? {
        set {
            self.layer = CALayer()
            self.layer?.contentsGravity = kCAGravityResizeAspectFill
            self.layer?.contents = newValue
            self.wantsLayer = true
            super.image = newValue
        }
        get {
            return super.image
        }
    }

    override func mouseDown(with event: NSEvent) { …

我在静态表视图中有 UITextView ，如果用户触摸textView 之外的其他区域，我想移除键盘

extension CheckinDetailTVC {

    // to remove keyboard if we touch other area
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(false)
    }

}

override func viewDidLoad() {
    super.viewDidLoad()
    let tapGestureReconizer = UITapGestureRecognizer(target: self, action: "tap:")
    view.addGestureRecognizer(tapGestureReconizer)
}

func tap(sender: UITapGestureRecognizer) {
    view.endEditing(true)
}

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    if text == "\n" {
        textView.resignFirstResponder()
    } …