在做视频开发时遇到屏幕旋转问题,其中涉及到 statusbar、 uinavigationcontroller、uitabbarcontroller 、uiviewcontroller 。
在设备锁屏下的整体效果图
ios-旋转.gif
主要涉及以下4点：
- 横竖屏的旋转
- 屏幕旋转相应改变视图位置
- 旋转时状态栏的隐藏与显示
- 锁屏
1、横竖屏旋转
第1步：
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-(uiinterfaceorientationmask)application:(uiapplication *)application supportedinterfaceorientationsforwindow:(uiwindow *)window {
// nslog(@"0000000---------%@",nsstringfromclass([[self topviewcontroller] class]));
// if ([nsstringfromclass([[self topviewcontroller] class]) isequaltostring:@"firstviewcontroller"]) {
// //横屏
// return uiinterfaceorientationmasklandscaperight;
// }
// //竖屏
// return uiinterfaceorientationmaskportrait;
nsuinteger orientations = uiinterfaceorientationmaskallbutupsidedown;
if(self.window.rootviewcontroller){
//取出当前显示的控制器
uiviewcontroller *presentedviewcontroller = [self topviewcontrollerwithrootviewcontroller:self.window.rootviewcontroller];
//按当前控制器支持的方向确定旋转方向(将旋转方向重新交给每个控制器自己控制)
nslog(@"%s, line = %d",__function__,__line__);
orientations = [presentedviewcontroller supportedinterfaceorientations];
}
return orientations;
}
//获取界面最上层的控制器
//- (uiviewcontroller*)topviewcontroller {
// nslog(@"%s, line = %d",__function__,__line__);
// return [self topviewcontrollerwithrootviewcontroller:[uiapplication sharedapplication].keywindow.rootviewcontroller];
//}
//一层一层的进行查找判断
- (uiviewcontroller*)topviewcontrollerwithrootviewcontroller:(uiviewcontroller*)rootviewcontroller {
nslog(@"%s, line = %d",__function__,__line__);
if ([rootviewcontroller iskindofclass:[uitabbarcontroller class]]) {
uitabbarcontroller* tabbarcontroller = (uitabbarcontroller*)rootviewcontroller;
nslog(@"tabbar:%@",nsstringfromclass([tabbarcontroller.selectedviewcontroller class]));
return [self topviewcontrollerwithrootviewcontroller:tabbarcontroller.selectedviewcontroller];
} else if ([rootviewcontroller iskindofclass:[uinavigationcontroller class]]) {
uinavigationcontroller* nav = (uinavigationcontroller*)rootviewcontroller;
nslog(@"nav:%@",nsstringfromclass([nav.visibleviewcontroller class]));
return [self topviewcontrollerwithrootviewcontroller:nav.visibleviewcontroller];
} else if (rootviewcontroller.presentedviewcontroller) {
nslog(@"present:%@",nsstringfromclass([rootviewcontroller.presentationcontroller class]));
uiviewcontroller* presentedviewcontroller = rootviewcontroller.presentedviewcontroller;
return [self topviewcontrollerwithrootviewcontroller:presentedviewcontroller];
} else {
nslog(@"root:%@",rootviewcontroller);
return rootviewcontroller;
}
}
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代码中通过 -(uiinterfaceorientationmask)application:(uiapplication *)application supportedinterfaceorientationsforwindow:(uiwindow *)window 方法将控制器交给自己控制，该方法默认值为 info.plist 中配置的 supported interface orientations 项的值。
第2步：在各控制器设置支持的方向
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//是否允许旋转(默认允许)
- (bool)shouldautorotate {
return yes;
}
- (uiinterfaceorientationmask)supportedinterfaceorientations{
//允许旋转的方向
return uiinterfaceorientationmaskall;
}
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其中 - supportedinterfaceorientations 方法在 ipad 中默认取值为 uiinterfaceorientationmaskall ，即默认支持所有屏幕方向；而 iphone 跟 ipod touch 的默认取值为 uiinterfaceorientationmaskallbutupsidedown ，即支持除竖屏向下以外的三个方向。
在设备屏幕旋转时，系统会调用 - shouldautorotate 方法检查当前界面是否支持旋转，只有 - shouldautorotate 返回 yes 的时候， - supportedinterfaceorientations 方法才会被调用，以确定是否需要旋转界面。
这个是 tabbarcontroller 中设置的,它会影响关联的 uiviewcontroller 的支持方向，需要在 uiviewcontroller 中进一步设置
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//此方法来控制能否横竖屏 控制锁屏
- (uiinterfaceorientationmask)supportedinterfaceorientations {
nslog(@"%s, line = %d",__function__,__line__);
uiinterfaceorientationmask inter;
if (_lockscreen) {
switch (_lockorientation) {
case 1:
inter = uiinterfaceorientationmaskportrait;
break;
case 2:
inter = uiinterfaceorientationmaskportraitupsidedown;
break;
case 3:
inter = uiinterfaceorientationmasklandscaperight;
break;
case 4:
inter = uiinterfaceorientationmasklandscapeleft;
break;
default:inter = uiinterfaceorientationmaskall;
break;
}
} else {
inter = uiinterfaceorientationmaskall;
}
//支持全部方向
return inter;
}
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第3步：强制转换控制器方向
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- (void)setinterorientation:(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];
}
}
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这样就可以完成横竖屏的切换。
2、屏幕旋转相应改变视图位置
这里先扩展 uideviceorientation & uiinterfaceorientation 的知识
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,通过 [uidevice currentdevice].orientation 获取当前设备的方向。
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typedef ns_enum(nsinteger, uideviceorientation) {
uideviceorientationunknown,
uideviceorientationportrait,
uideviceorientationportraitupsidedown, // device oriented vertically, home button on the top 竖屏向下，即头在下，home 键在上
uideviceorientationlandscapeleft, // device oriented horizontally, home button on the right 横屏头在左，home键在右
uideviceorientationlandscaperight, // device oriented horizontally, home button on the left 横屏头在右，home键在左
uideviceorientationfaceup, // device oriented flat, face up
uideviceorientationfacedown // device oriented flat, face down
} ;
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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, 通过 [uiapplication sharedapplication].statusbarorientation 即状态栏的方向获取当前界面方向。
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// note that uiinterfaceorientationlandscapeleft is equal to uideviceorientationlandscaperight (and vice versa).
// this is because rotating the device to the left requires rotating the content to the right.
typedef ns_enum(nsinteger, uiinterfaceorientation) {
uiinterfaceorientationunknown = uideviceorientationunknown,
uiinterfaceorientationportrait = uideviceorientationportrait,
uiinterfaceorientationportraitupsidedown = uideviceorientationportraitupsidedown,
uiinterfaceorientationlandscapeleft = uideviceorientationlandscaperight,
uiinterfaceorientationlandscaperight = uideviceorientationlandscapeleft
}
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uiinterfaceorientationmask 支持的方向
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// ios 6 之后用于控制界面的枚举值
typedef ns_options(nsuinteger, uiinterfaceorientationmask) {
uiinterfaceorientationmaskportrait = (1 << uiinterfaceorientationportrait),
uiinterfaceorientationmasklandscapeleft = (1 << uiinterfaceorientationlandscapeleft),
uiinterfaceorientationmasklandscaperight = (1 << uiinterfaceorientationlandscaperight),
uiinterfaceorientationmaskportraitupsidedown = (1 << uiinterfaceorientationportraitupsidedown),
uiinterfaceorientationmasklandscape = (uiinterfaceorientationmasklandscapeleft | uiinterfaceorientationmasklandscaperight),
uiinterfaceorientationmaskall = (uiinterfaceorientationmaskportrait | uiinterfaceorientationmasklandscapeleft | uiinterfaceorientationmasklandscaperight | uiinterfaceorientationmaskportraitupsidedown),
uiinterfaceorientationmaskallbutupsidedown = (uiinterfaceorientationmaskportrait | uiinterfaceorientationmasklandscapeleft | uiinterfaceorientationmasklandscaperight),
}
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由上可以发现：
ios 6 及之后版本使用的 uiinterfaceorientationmask 类型来控制屏幕屏幕方向，该类型也新增加了几个枚举取值，可用一个枚举取值来代表多个屏幕方向，使用起来更方便。
注意在 uiinterfaceorientation 中有注释
note that uiinterfaceorientationlandscapeleft is equal to uideviceorientationlandscaperight (and vice versa).
this is because rotating the device to the left requires rotating the content to the right，大意是界面的左转相当于设备的右转，如果设备向左转时就需要内容（即界面）向右转。即：
uiinterfaceorientationlandscapeleft = uideviceorientationlandscaperightuiinterfaceorientationlandscaperight = uideviceorientationlandscapeleft
下面还会举例说明。
其实 uideviceorientation 与 uiinterfaceorientation 是两个互不相干的属性，通常情况下会一起出现，在这里正好利用此特性在屏幕旋转后进行重新布局。
第1步：监听 uideviceorientationdidchangenotification 状态
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//监听设备旋转 改变 视图 对应位置
[[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(deviceorientationdidchange) name:uideviceorientationdidchangenotification object:nil];
//用来控制横竖屏时调整视图位置
- (void)deviceorientationdidchange
{
[self isportrait];
}
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第2步：重新布局
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if (_interorientation == uiinterfaceorientationportrait || _interorientation == uiinterfaceorientationportraitupsidedown) {
self.top.constant = 145;
self.bottom.constant = 210;
} else if (_interorientation == uiinterfaceorientationlandscaperight || _interorientation == uiinterfaceorientationlandscapeleft) {
self.top.constant = 40;
self.bottom.constant = 50;
}
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例如：竖屏转横屏
界面竖屏 uiinterfaceorientationportrait ->横屏 uiinterfaceorientationlandscaperight ，设备方向 uideviceorientationportrait -> uideviceorientationlandscapeleft ,在设备发生变化这个过程触发 uideviceorientationdidchangenotification 监听，然后进行重新布局。
3、旋转时状态栏的隐藏与显示
这里只记述旋转时状态栏的变化，由竖屏想横屏变化时状态栏会消失。
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//在需要的`uiviewcontroller`设置是否隐藏
- (bool)prefersstatusbarhidden {
nslog(@"%s, line = %d",__function__,__line__);
return no;
}
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4、锁屏
锁屏时，不管系统锁屏是否关闭、push 或 present 返回后，界面依然保持不变。
第1步：设置锁屏
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- (ibaction)lockaction:(uibutton *)sender {
if (_lockscreen) {
_lockscreen = no;
[sender settitle:@"锁定屏幕" forstate:uicontrolstatenormal];
} else {
_lockscreen = yes;
[sender settitle:@"解开屏幕" forstate:uicontrolstatenormal];
}
_lockorientation = _interorientation;
}
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第2步：绕过强转
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- (void)interfaceorientation:(uiinterfaceorientation)orientation
{
[self isportrait];
//锁屏情况下 不旋转
if (!_lockscreen) {
[self setinterorientation:orientation];
}
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第3步：针对 push 或 present 返回后
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- (void)viewwillappear:(bool)animated {
if (_lockscreen) {
//记录返回时的界面状态
[self setinterorientation:_lockorientation];
} else {
[self isportrait];
}
}
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5、 针对特定 uiviewcontroller 方向的支持
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-(uiinterfaceorientationmask)application:(uiapplication *)application supportedinterfaceorientationsforwindow:(uiwindow *)window {
if ([nsstringfromclass([[self topviewcontroller] class]) isequaltostring:@"firstviewcontroller"]) {
//横屏
return uiinterfaceorientationmasklandscaperight;
}
//竖屏
return uiinterfaceorientationmaskportrait;
}
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最后的献上 github 代码，还有2个小的 bug ，有兴趣的朋友欢迎来探讨。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.jianshu.com/p/5f82baaab740