强制横屏:
方法一:
关于强制横屏看了很多文章,首先第一个方法是invocation,这个方法可以实现横屏效果,但是后来看了博客都不推荐使用这种方法,而且屏幕旋转的时候,会出现空白的状态
这个方法有个问题,现在旋转的时候,页面会出现先竖屏在横屏的状态,不知道哪里出了问题?
源码:
+ (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];
}
}
方法二:
因为页面的跳转方式全都使用了push方法,所以
- (BOOL)shouldAutorotate ;
- (UIInterfaceOrientationMask)supportedInterfaceOrientations ;
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation ;
不能执行(当然我也不确定是不是我操作的问题)
项目的需求:是在视频页面横屏操作,然后从视频页面push到其他页面,其他页面在push到签字页面,签字页面也需要横屏操作
在网上找到的方法:
第一步:
在appdelegate中声明一个属性@property (nonatomic, assign) BOOL allowRotation;
然后在appdelegate中实现方法
源码:
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window {
if (self.allowRotation == YES) {
return UIInterfaceOrientationMaskLandscapeRight;
}else{
return UIInterfaceOrientationMaskPortrait;
}
}
第二步:
在viewcontroller页面中实现方法,实现旋转屏幕
源码:
- (void)setNewOrientation:(BOOL)fullscreen{
if (fullscreen) {
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}else{
NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];
[[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];
NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}
}
第三步:
在需要旋转屏幕页面初始化的时候,调用横屏方法
AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = YES;//(以上2行代码,可以理解为打开横屏开关)
[self setNewOrientation:YES];//调用转屏代码
在页面返回按钮的操作中,将屏幕返回竖屏状态
AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
appDelegate.allowRotation = NO;//(以上2行代码,可以理解为打开横屏开关)
[self setNewOrientation:NO];//调用转屏代码
方法三:
使用view的动画效果实现屏幕旋转,但是整个系统还依然是竖屏状态, 最后将此方法修改了.这里记录下view的动画效果
源码:
self.originFrame = self.view.frame;
CGFloat height = [[UIScreen mainScreen] bounds].size.width;
CGFloat width = [[UIScreen mainScreen] bounds].size.height;
CGRect frame = CGRectMake((height - width) / 2, (width - height) / 2, width, height);
self.frame = frame;
[UIView animateWithDuration:0.3f animations:^{
self.frame = frame;
[self.view setTransform:CGAffineTransformMakeRotation(M_PI_2)];
} completion:^(BOOL finished) {
}];
