UIViewController切换及简单动画

UIViewController应该是我们最常用的。

那么最简单的切换方式是什么了？

 func presentViewController(viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)?)

同时可以设置一些简单动画，淡入淡出，翻页等等

我们首先创建一个项目，他会有一个自带的视图控制器ViewController

然后我们再创建视图控制器用来切换。

import UIKit

class MyRootViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.view.backgroundColor=UIColor.lightGrayColor()
        
        let btn=UIButton(frame: CGRectMake(20, 120, 320, 36))
        btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        btn.setTitle("返回", forState: UIControlState.Normal)
        btn.addTarget(self, action: "back", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(btn)
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    

    func back(){
        self.dismissViewControllerAnimated(true, completion: nil)
    }
    

}

我们可以看到这个类很简单就是一个UIViewController的子类。

给他创建button用来返回。

接下来，我们给自带的ViewController添加四个Button分别测试四种切换方式

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let btn=UIButton(frame: CGRectMake(20, 100, 320, 36))
        btn.setTitle("垂直切换", forState: UIControlState.Normal)
        btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        btn.tag=90
        btn.addTarget(self, action: "testAct:", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(btn)
        
        
        let btn1=UIButton(frame: CGRectMake(20, 150, 320, 36))
        btn1.setTitle("旋转", forState: UIControlState.Normal)
        btn1.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        btn1.tag=91
        btn1.addTarget(self, action: "testAct:", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(btn1)
        
        let btn2=UIButton(frame: CGRectMake(20, 200, 320, 36))
        btn2.setTitle("淡入淡出", forState: UIControlState.Normal)
        btn2.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        btn2.tag=92
        btn2.addTarget(self, action: "testAct:", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(btn2)
        
        let btn3=UIButton(frame: CGRectMake(20, 250, 320, 36))
        btn3.setTitle("翻页", forState: UIControlState.Normal)
        btn3.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
        btn3.tag=93
        btn3.addTarget(self, action: "testAct:", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(btn3)
        
        
    }

button点击后对应的方法如下

    func testAct(b:UIButton){
        let rootVC=MyRootViewController()
        
        
        
        if(b.tag==90){
            rootVC.modalTransitionStyle = .CoverVertical
        }else if(b.tag==91){
            rootVC.modalTransitionStyle = .FlipHorizontal
        }else if(b.tag==92){
            rootVC.modalTransitionStyle = .CrossDissolve
        }else if(b.tag==93){
            rootVC.modalTransitionStyle = .PartialCurl
        }
        
        self.presentViewController(rootVC, animated: true, completion: nil)
        
        
    }

其中modalTr5ansitionStyle 是一个枚举，有四个值，分别代表四种奇幻方式

我们测试一下看效果吧。有问题欢迎加群讨论

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