iOS app进入后台遮罩的实现

- (void)applicationDidEnterBackground:(UIApplication *)application {

    if (yesLogin) {

        dispatch_async(dispatch_get_main_queue(), ^{

            [self add];

            yesLogin = YES;

        });

    }

    NSLog(@"self.EffectScenView.subviews%@",self.EffectScenView.subviews);

        self.date = [NSDate date];

    NSLog(@"self.date%@",self.date);

    NSLog(@"进入后台---applicationDidEnterBackground----"); //进入后台

}

- (void)applicationDidBecomeActive:(UIApplication *)application {

    dispatch_async(dispatch_get_main_queue(), ^{

        [self remoScenView];

        NSLog(@"yesLogin%hhd",yesLogin);

        NSDate *changeDate = [NSDate date];

        if ([self.date isThisTodayHour] && yesLogin) {

            NSLog(@"++++++++++++++++++++++++++++++++");

            if ( [changeDate deltaFrom:self.date].minute >= 15) {

             NSLog(@"11111111111111+");

                dispatch_async(dispatch_get_main_queue(), ^{

                    LoginViewController *logn = [LoginViewController new];

                    [UIApplication sharedApplication].keyWindow.rootViewController = logn;

                });

            }

        }

        if ([self.date isThisTodayPreHour] && yesLogin) {

            NSCalendar *cal = [NSCalendar currentCalendar];

            unsigned int unitFlags = kCFCalendarUnitYear |kCFCalendarUnitMonth | NSCalendarUnitDay |NSCalendarUnitHour | NSCalendarUnitMinute;

            NSDateComponents *dd = [cal components:unitFlags fromDate:self.date];

            NSInteger minute = [dd minute];

            if ([changeDate deltaFrom:self.date].minute +(60 -minute) >= 15) {

                dispatch_async(dispatch_get_main_queue(), ^{

                    LoginViewController *logn = [LoginViewController new];

                    [UIApplication sharedApplication].keyWindow.rootViewController = logn;

                });

            }

        }

        NSLog(@"进入前台---applicationDidBecomeActive----");//进入前台

    });

}

 //添加window 由于我的项目中还有其他的弹出window,为了避免冲突所以这里+2

- (void)add {

    self.EffectScenView.windowLevel = UIWindowLevelAlert+2;

    [self.EffectScenView makeKeyAndVisible];

}

//移除window

-(void)remoScenView{

    dispatch_async(dispatch_get_main_queue(), ^{

        self.EffectScenView.hidden=YES;

        self.EffectScenView.rootViewController = nil;

        [self.EffectScenView resignKeyWindow];

        [self.EffectScenView removeFromSuperview];

    });

}

//判断是否是前一个小时

- (BOOL)isThisTodayPreHour

{

    //日期格式化类

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    formatter.dateFormat = @"yyyy-MM-dd";

    NSDate *nowDate = [formatter dateFromString:[formatter stringFromDate:[NSDate date]]];

    NSDate *selfDate = [formatter dateFromString:[formatter stringFromDate:self]]; //self 表示的是调用当前方法的对象

    

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSDateComponents *compt = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour fromDate:selfDate toDate:nowDate options:0];

    //时间差是一天

    return compt.year == 0 && compt.month == 0 && compt.day == 0 && compt.hour == 1;

    

}

 //判断是否是当前这个小时

- (BOOL)isThisTodayHour

{

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSCalendarUnit unite = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour ;

    NSDateComponents *nowCmpts = [calendar components:unite fromDate:[NSDate date]];

    NSDateComponents *selfCmpt = [calendar components:unite fromDate:self];

    return nowCmpts.year == selfCmpt.year

    && nowCmpts.month == selfCmpt.month

    && nowCmpts.day == selfCmpt.day && nowCmpts.hour == selfCmpt.hour;

}