特定页面实现旋转效果

1.在AppDelegate.h 里添加标记

2.在AppDelegate.m 里添加这个方法

3.打开屏幕旋转

[(AppDelegate*)[UIApplication sharedApplication].delegate setAllowRotation:YES];

4.取消屏幕旋转

[(AppDelegate*)[UIApplication sharedApplication].delegate setAllowRotation:NO];

[[NSNotificationCenter defaultCenter] removeObserver:self];

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

SEL selector = NSSelectorFromString(@"setOrientation:");

NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDeviceinstanceMethodSignatureForSelector:selector]];

[invocation setSelector:selector];

[invocation setTarget:[UIDevice currentDevice]];

int val = UIInterfaceOrientationPortrait;

[invocation setArgument:&val atIndex:2];

[invocation invoke];

}