Swift学习之常用UI的使用

Swift学习之常用UI的使用

最近笔者在开始学习苹果最新的编程语言，因为笔者认为，苹果既然出了这门语言就绝对不会放弃，除非苹果倒闭了（当然这里知识一个玩笑）。

所以在不久的将来，swift绝对是iOS 开发的主导语言，也许不会完全取代OC。

笔者学完swift的语法之后就开始着手UI了，因为我觉得有着一定的OC基础。所以这里关于swift的语法就不做多介绍了，在后面的文章中，我将会详细介绍一下关于swift中的重点，难点语法和一些新特性。

下面是我在学习UI的时候自己总结的一些swift创建UI的代码，个人感觉和OC区别不到，但是还是有需要注意的地方。

override func viewDidLoad()
    {
        self.view!.backgroundColor = UIColor.whiteColor()
            /**
            *  1*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UILabel
            */
        if self.title == "UILabel"
        {
            var label = UILabel(frame: self.view.bounds)

　　//这里也可以先创建再设置frame
            label.backgroundColor = UIColor.clearColor()
            label.textAlignment = NSTextAlignment.Center
            label.font = UIFont.systemFontOfSize(36)
            label.text = "Hello, Swift"
            self.view.addSubview(label)
        }
            /**
            *   2*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIButton
            */
        else if self.title == "UIButton"
        {
            var button = UIButton.buttonWithType(UIButtonType.System) as? UIButton
            button!.frame = CGRectMake(110.0, 120.0, 100.0, 50.0)
            button!.backgroundColor = UIColor.grayColor()
            button?.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
            button!.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Highlighted)
            button?.setTitle("Touch Me", forState: UIControlState.Normal)
            button?.setTitle("Touch Me", forState: UIControlState.Highlighted)
            button?.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
            button!.tag = 100
            self.view.addSubview(button!)
        }
            /**
            *  3*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UIImageView
            */
        else if self.title == "UIImageView"
        {
            var image     = UIImage(named: "swift-hero.png")
           
var imageView = UIImageView(frame:
CGRectMake((CGRectGetWidth(self.view.bounds) - image!.size.width) / 2.0,
120.0, image!.size.width, image!.size.height))
            imageView.image = image
            self.view.addSubview(imageView)
        }
            /**
            *   4*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UISilder
            */
        else if self.title == "UISlider"
        {
            var slider = UISlider(frame:CGRectMake(60.0, 120.0, 200.0, 30.0))
            self.view.addSubview(slider)
        }
            /**
            *  5*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UIWebView
            */
        else if self.title == "UIWebView"
        {
            var webView = UIWebView(frame:self.view.bounds)
            var url = NSURL(string: "http://caipiao.m.taobao.com")
            var request = NSURLRequest(URL: url!)
            webView.loadRequest(request)
            self.view.addSubview(webView)
        }
            /**
            *   6*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UISegmentedControl
            */
        else if self.title == "UISegmentedControl"
        {
            var segmentControl = UISegmentedControl(items:["A", "B", "C", "D"])
            segmentControl.frame = CGRectMake(110.0, 120.0, 100.0, 30.0)
            self.view.addSubview(segmentControl)
        }
            /**
            *   7*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UISwitch
            */
        else if self.title == "UISwitch"
        {
            var switchControl = UISwitch(frame:CGRectMake(130.0, 120.0, 100.0, 30.0))
            switchControl.on = true
            self.view.addSubview(switchControl)
        }
            /**
            *   8*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UItxetField
            */
        else if self.title == "UITextField"
        {
            var textField = UITextField(frame:CGRectMake(60.0, 120.0, 200.0, 30.0))
            textField.backgroundColor = UIColor.lightGrayColor()
            textField.placeholder = "input text"
            self.view.addSubview(textField)
        }
            /**
            *   9*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIScrollView
            */
        else if self.title == "UIScrollView"
        {
            var scrollView = UIScrollView(frame:CGRectMake(60.0, 120.0, 200.0, 200.0))
            scrollView.pagingEnabled = true
            scrollView.showsVerticalScrollIndicator = false
            self.view.addSubview(scrollView)
            
            var fX: CGFloat = 0.0
            for(var i = 0; i < 3; ++i)
            {
                var view = UIView(frame:CGRectMake(fX, 0.0, 200.0, 200.0))
                fX += 200.0
                view.backgroundColor = UIColor.redColor()
                scrollView.addSubview(view)
            }
            scrollView.contentSize = CGSizeMake(3 * 200.0, 200.0)
            self.view.addSubview(scrollView)
        }
            /**
            *   10*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UISearchBar
            */
        else if self.title == "UISearchBar"
        {
            var searchBar = UISearchBar(frame:CGRectMake(10.0, 120.0, 300.0, 30.0))
            searchBar.showsCancelButton = true
            searchBar.searchBarStyle = UISearchBarStyle.Minimal // Default, Prominent, Minimal

self.view.addSubview(searchBar)
        }
            /**
            *   11*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIpageControl
            */
        else if self.title == "UIPageControl"
        {
            // PageControl
            var pageControl = UIPageControl(frame:CGRectMake(60.0, 120.0, 200.0, 200.0))
            pageControl.numberOfPages = 5
            pageControl.currentPageIndicatorTintColor = UIColor.blackColor()
            pageControl.pageIndicatorTintColor = UIColor.redColor()
            self.view.addSubview(pageControl)
        }
            /**
            *   12*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIDatePicker
            */
        else if self.title == "UIDatePicker"
        {
            var datePicker = UIDatePicker(frame:CGRectMake(0.0, 120.0, 200.0, 200.0))
            self.view.addSubview(datePicker)
        }
            /**
            *  13*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UIPickerView
            */
        else if self.title == "UIPickerView"
        {
            var pickerView = UIPickerView(frame:CGRectMake(10.0, 120.0, 300.0, 200.0))
            pickerView.delegate = self
            pickerView.dataSource = self
            self.view.addSubview(pickerView)
        }
            /**
            *   14*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIProgressView
            */
        else if self.title == "UIProgressView"
        {
            var progressView = UIProgressView(progressViewStyle:UIProgressViewStyle.Default)
            progressView.frame = CGRectMake(10.0, 120.0, 300.0, 30.0)
            progressView.setProgress(0.8, animated: true)
            self.view.addSubview(progressView)
        }
            /**
            *  15*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UITextView
            */
        else if self.title == "UITextView"
        {
            var textView = UITextView(frame:CGRectMake(10.0, 120.0, 300.0, 200.0))
            textView.backgroundColor = UIColor.lightGrayColor()
            textView.editable = false
            textView.font = UIFont.systemFontOfSize(20)
           
textView.text = "Swift is an innovative new programming language for
Cocoa and Cocoa Touch. Writing code is interactive and fun, the syntax
is concise yet expressive, and apps run lightning-fast. Swift is ready
for your next iOS and OS X project — or for addition into your current
app — because Swift code works side-by-side with Objective-C."
            self.view.addSubview(textView)
        }
            /**
            *   16*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIToolbar
            */
        else if self.title == "UIToolbar"
        {
            var toolBar = UIToolbar(frame:CGRectMake(60.0, 120.0, 200.0, 30.0))

var flexibleSpace = UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.FlexibleSpace, target:nil, action:nil)
            var barBtnItemA = UIBarButtonItem(title: "A", style:UIBarButtonItemStyle.Plain, target:nil, action:nil)
            var barBtnItemB = UIBarButtonItem(title: "B", style:UIBarButtonItemStyle.Plain, target:nil, action:nil)
            var barBtnItemC = UIBarButtonItem(title: "C", style:UIBarButtonItemStyle.Plain, target:nil, action:nil)
            var barBtnItemD = UIBarButtonItem(title: "D", style:UIBarButtonItemStyle.Plain, target:nil, action:nil)
            
           
toolBar.items = [flexibleSpace, barBtnItemA, flexibleSpace,
barBtnItemB, flexibleSpace, barBtnItemC, flexibleSpace, barBtnItemD,
flexibleSpace]
            self.view.addSubview(toolBar)
        }
            /**
            *  16*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊ UIActionSheet
            */
        else if self.title == "UIActionSheet"
        {
            // Button
            var button = UIButton.buttonWithType(UIButtonType.System) as? UIButton
            button!.frame = CGRectMake(60.0, 120.0, 200.0, 50.0)
            button!.backgroundColor = UIColor.grayColor()
            button?.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
            button!.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Highlighted)
            button?.setTitle("Show ActionSheet", forState: UIControlState.Normal)
            button?.setTitle("Show ActionSheet", forState: UIControlState.Highlighted)
            button?.addTarget(self, action: "showActionSheet", forControlEvents: UIControlEvents.TouchUpInside)
            button!.tag = 101
            self.view.addSubview(button!)
        }
            /**
            *   17*＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊UIActivityIndicatorView
            */
        else if self.title == "UIActivityIndicatorView"
        {
            var activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle:UIActivityIndicatorViewStyle.Gray)
            activityIndicatorView.frame = CGRectMake(140.0, 120.0, 40.0, 40.0)
            activityIndicatorView.startAnimating()
            self.view.addSubview(activityIndicatorView)
        }
        else
        {}
    }

下面是一些UI中对应按钮的target，和一些需要实现的方法：

override func viewWillAppear(animated: Bool) {}
    override func viewDidAppear(animated: Bool) {}
    override func viewWillDisappear(animated: Bool) {}
    override func viewDidDisappear(animated: Bool) {}
    
    // Button Action
    func buttonAction(sender: UIButton)
    {
        var mathSum = MathSum()
        var sum = mathSum.sum(11, number2: 22)
        
       
var alert = UIAlertController(title: "Title", message: String(format:
"Result = %i", sum), preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert, animated: true, completion: nil)
        
        /*
        var alertView = UIAlertView()
        alertView.title = "Title"
        alertView.message = "Message"
        alertView.addButtonWithTitle("OK")
        alertView.show()
        */

}

// Button Handler
    // showActionSheet
    func showActionSheet()
    {
       
var alertController = UIAlertController(title: "ActionSheet", message:
"Message", preferredStyle: UIAlertControllerStyle.ActionSheet)
        alertController.addAction(UIAlertAction(title: "Go Back", style: UIAlertActionStyle.Destructive, handler: nil))
        self.presentViewController(alertController, animated: true, completion:nil)
    }
        // didReceiveMemoryWarning
    override func didReceiveMemoryWarning()
    {

　　／＊＊＊＊＊＊＊＊／

　　}

后面的文章里，笔者将给大家打来使用swift开发项目的一些常用技术和区分swift与OC开发！