实现：子类化UIWindow，并使app使用自定义的这个window。（也可以子类化UIApplication，修改main函数参数）代码演示：屏幕闲置180s弹出手势密码解锁界面//ICWindow.h文件#import@interface ICWindow : UIWindow
/*!
* 计时器是否可用（处在手势密码页时不可用）
*/
- (void)setTimerEnable:(BOOL)enable;
/*!
* 停止闲置计时
*/
- (void)stopIdleTiming;
/*!
* 重新开始闲置计时
*/
- (void)resetIdleTimer;
@end
//ICWindow.m文件
#import "ICWindow.h"
#import "GesturePasswordViewController.h"
@interface ICWindow ()
@property (nonatomic, assign) NSInteger idleTime; //闲置时间
@property (nonatomic, assign) BOOL timeEnable; //计时器是否可用
@end
@implementation ICWindow
- (void)sendEvent:(UIEvent *)event{
[super sendEvent:event];
// 只在开始或结束触摸时 reset 闲置时间, 以减少不必须要的时钟 reset 动作
NSSet *allTouches = [event allTouches];
if ([allTouches count] > 0) {
// allTouches.count 似乎只会是 1, 因此 anyObject 总是可用的
UITouchPhase phase =((UITouch *)[allTouches anyObject]).phase;
if (phase ==UITouchPhaseBegan || phase == UITouchPhaseEnded)
[self resetIdleTimer];
}
}
- (void)resetIdleTimer {
if (self.timeEnable == YES) {
[self stopIdleTiming];
self.idleTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(idleTimerexecuted) userInfo:nil repeats:YES];
}
}
- (void)idleTimerexecuted {
self.idleTime += 1;
if (self.idleTime == 180) {
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *password = [userDefaults objectForKey:@"gesturePassword"];
if (password) {
//闲置180s 弹出手势密码界面
GesturePasswordViewController *gesturePasswordVC = [[GesturePasswordViewController alloc]initWithNibName:@"GesturePasswordViewController" bundle:nil isCheck:YES];
[self.rootViewController presentViewController:gesturePasswordVC animated:YES completion:nil];
[self setTimerEnable:NO];
}
}
}
- (void)stopIdleTiming{
self.idleTime = 0;
if (self.idleTimer) {
[self.idleTimer invalidate];
self.idleTimer = nil;
}
}
- (void)setTimerEnable:(BOOL)enable{
self.timeEnable = enable;
if (!enable) {
[self stopIdleTiming];
}
}
@end