Swift 支持某个页面横竖屏切换与强制横屏
首先需要清晰几个概念
-
UIDeviceOrientation 设备的物理方向
- UIDeviceOrientation即我们手持的移动设备的Orientation，是一个三围空间，有六个方向
public enum UIDeviceOrientation : Int {
case unknown
case portrait // Device oriented vertically, home button on the bottom
case portraitUpsideDown // Device oriented vertically, home button on the top
case landscapeLeft // Device oriented horizontally, home button on the right
case landscapeRight // Device oriented horizontally, home button on the left
case faceUp // Device oriented flat, face up
case faceDown // Device oriented flat, face down
}
- UIInterfaceOrientation 界面的显示方向
- UIInterfaceOrientation即我们看到的视图的Orientation，可以理解为statusBar所在的方向，是一个二维空间，有四个方向
public enum UIInterfaceOrientation : Int {
case unknown
case portrait
case portraitUpsideDown
case landscapeLeft
case landscapeRight
}
支持某个页面横竖屏切换
项目要求是要某个界面能够横竖屏显示，其他界面要竖屏显示
1.打开 General 中的 Device orientation 中的 landscapeLeft 与 landscapeRight
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2.在AppDelegate中设置app支持的方法
这里要设置一个全局变量，判断支持的方向
var blockRotation = Bool()
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
if blockRotation {
return .allButUpsideDown
}
return .portrait
}
3.在需要支持横竖屏的控制器中
let appDelegate = UIApplication.shared.delegate as! AppDelegate
在viewDidLoad或viewWillAppear中
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
appDelegate.blockRotation = true
}
在viewWillDisAppear中
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
appDelegate.blockRotation = false
//判断退出时是否是横屏
if UIApplication.shared.statusBarOrientation.isLandscape {
//是横屏让变回竖屏
setNewOrientation(fullScreen: false)
}
}
退出时需要回到竖屏的状态
//横竖屏
func setNewOrientation(fullScreen: Bool) {
if fullScreen { //横屏
let resetOrientationTargert = NSNumber(integerLiteral: UIInterfaceOrientation.unknown.rawValue)
UIDevice.current.setValue(resetOrientationTargert, forKey: "orientation")
let orientationTarget = NSNumber(integerLiteral: UIInterfaceOrientation.landscapeLeft.rawValue)
UIDevice.current.setValue(orientationTarget, forKey: "orientation")
}else { //竖屏
let resetOrientationTargert = NSNumber(integerLiteral: UIInterfaceOrientation.unknown.rawValue)
UIDevice.current.setValue(resetOrientationTargert, forKey: "orientation")
let orientationTarget = NSNumber(integerLiteral: UIInterfaceOrientation.portrait.rawValue)
UIDevice.current.setValue(orientationTarget, forKey: "orientation")
}
}
4.判断页面方向
横竖屏这里已经实现了，难处理的是横竖屏后界面视图的适配
用snapKit布局会方便很多，但有些布局，需要判断当前界面时竖屏还是横屏
//statusBar的朝向
UIApplication.shared.statusBarOrientation.isLandscape
- statusBarOrientation 有两个属性，isLandscape、isPortrait 用来判断是横屏还是竖屏，这是对页面的判断
在有弹出窗的时候，在窗口弹出时判断是横屏还是竖屏，分别做不同的布局
5.判断设备物理方便改变
//注册通知
if !UIDevice.current.isGeneratingDeviceOrientationNotifications {
//生成通知
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
}
NotificationCenter.default.addObserver(self, selector: #selector(handleDeviceOrientationChange(notification:)), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
实现通知的方法
@objc private func handleDeviceOrientationChange(notification: Notification) {
let orientation = UIDevice.current.orientation
switch orientation {
case .portrait:
/* iOS8之后,横屏UIScreen.main.bounds.width等于竖屏时的UIScreen.main.bounds.height
let ScreenW = UIApplication.shared.statusBarOrientation.isLandscape ? UIScreen.main.bounds.size.height : UIScreen.main.bounds.size.width
let ScreenH = UIApplication.shared.statusBarOrientation.isLandscape ? UIScreen.main.bounds.size.width : UIScreen.main.bounds.size.height
ScreenW 记录的是屏幕短边的长度
ScreenH 记录的是屏幕长边的长度
*/
showLabel.frame = CGRect(x: 0, y: 0, width: ScreenW, height: 20)
case .landscapeLeft:
showLabel.frame = CGRect(x: 0, y: 0, width: ScreenW, height: 20)
case .landscapeRight:
//横屏后做界面的调整的代码
showLabel.frame = CGRect(x: 200, y: 200, width: 80, height: 20)
default:
break
}
}
最后移除通知
deinit {
//移除通知
NotificationCenter.default.removeObserver(self)
UIDevice.current.endGeneratingDeviceOrientationNotifications()
}
-
这里用了两个判断：
-
判断当前页面是横屏还是竖屏 UIApplication.shared.statusBarOrientation.isLandscape (页面方向)
-
判断当前手机发生了横屏切换还是竖屏切换： 通知的方法 let orientation =UIDevice.current.orientation （设备的方向） 在通知的方法里完成布局
-
项目中比demo中布局复杂，使用这两个判断结合的方式进行布局
强制横屏
1.关闭 General 中的 Device orientation 中的 landscapeLeft 与 landscapeRight
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2.在AppDelegate中设置app支持的方法
这里要设置一个全局变量，判断支持的方向，这里支持一个方向
var blockRotation = Bool()
func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
if blockRotation {
return .landscapeLeft
}
return .portrait
}
3. 强制横屏方法
swift移除了NSInvocation, 只能桥接，需要创建桥接文件，注意桥接文件路径
// h文件
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface DeviceTool : NSObject
+ (void)interfaceOrientation:(UIInterfaceOrientation )orientation;
@end
//m文件
#import "DeviceTool.h"
@interface DeviceTool ()
@end
@implementation DeviceTool
+ (void)interfaceOrientation:(UIInterfaceOrientation)orientation{
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
SEL selector = NSSelectorFromString(@"setOrientation:");
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
[invocation setSelector:selector];
[invocation setTarget:[UIDevice currentDevice]];
int val = orientation;
// 从2开始是因为0 1 两个参数已经被selector和target占用
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}
@end
4.实现横屏
实现的是强制转landscapeLeft方向，与appDelegate中支持的方向一致，这样是否打开系统竖排方向锁定不影响强转方向
@objc func buttonClick(btn:UIButton) {
btn.isSelected = !btn.isSelected
if btn.isSelected {
appDelegate.blockRotation = true
DeviceTool.interfaceOrientation(.landscapeLeft)
}else{
appDelegate.blockRotation = false
DeviceTool.interfaceOrientation(.portrait)
}
}
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