钟表效果

标签：钟表   cgaffinetransformmak   transform   

最近在做一个项目，上面有钟表的显示。钟表的显示无非用到角度旋转。先看下效果图：

制作过程如下：

先切出四张图：表盘，三个指针（沿着边界切）

代码如下： 利用CGAffineTransformMakeRotation顺时针旋转，计算好弧度传入。

//UI

//注意指针的添加顺序

 UIImageView *watchImageView =[[UIImageViewalloc]initWithFrame:CGRectMake(0,0,self.width,self.height)];

    watchImageView.image =PNGImage(@"watch");

    [selfaddSubview:watchImageView];

    //因为 CGAffineTransformMakeRotation旋转是以中心点进行旋转，所以要在各个指针下创建一个底部视图，然后把指针放上去，定好位置。使得实现指针旋转效果。

    UIView *minuteView = [[UIViewalloc]initWithFrame:CGRectMake((watchImageView.width -6.0)/2.0,0,6.0,160)];

    minuteView.backgroundColor =ClearColor;

    [selfaddSubview:minuteView];

    UIImageView *minuteImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,8,6.0,75)];

    minuteImageView.image =PNGImage(@"minute");

    [minuteViewaddSubview:minuteImageView];

    UIView *hourView = [[UIViewalloc]initWithFrame:CGRectMake((watchImageView.width -6.0)/2.0,0,6.0,160)];

    hourView.backgroundColor =ClearColor;

    [selfaddSubview:hourView];

    UIImageView *hourImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,18,6.0,65)];

    hourImageView.image =PNGImage(@"hour");

    [hourViewaddSubview:hourImageView];

    UIView *secondView = [[UIViewalloc]initWithFrame:CGRectMake((watchImageView.width -6.0)/2.0,0,6.0,160)];

    [selfaddSubview:secondView];

    UIImageView *secondImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,5,6.0,90)];

    secondImageView.image =PNGImage(@"second");

    [secondViewaddSubview:secondImageView];

//根据当前时间初始角度

     NSDate *today = [NSDatedate]; 

    NSCalendar *greCalendar = [[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    NSDateComponents *dateComponents = [greCalendarcomponents:NSCalendarUnitHour |NSCalendarUnitMinute | NSCalendarUnitSecondfromDate:today];

    NSInteger hour = dateComponents.hour; 

    NSInteger minute = dateComponents.minute;

    NSInteger second = dateComponents.second;

    float hourAngle = hour/6.0 *M_PI;

    float minuteAngle = minute/30.0 *M_PI;

    float secondAngle = second/30.0 *M_PI;

    hourView.transform =CGAffineTransformMakeRotation(hourAngle);

   minuteView.transform =CGAffineTransformMakeRotation(minuteAngle);

   secondView.transform =CGAffineTransformMakeRotation(secondAngle);

[NSTimerscheduledTimerWithTimeInterval:0.05target:selfselector:@selector(watchRotation)userInfo:nilrepeats:YES];

// 计算得知，每0.05s，秒针旋转M_PI/600，分针旋转M_PI/36000，时针旋转M_PI/43200

- (void)watchRotation

{

    _secondAngle +=M_PI/600;

    if (_secondAngle/2.0 >M_PI) {

        _secondAngle =0;  //注意归0

    }

    _watchImageView.secondView.transform =CGAffineTransformMakeRotation(_secondAngle);

    _minuteAngle +=M_PI/36000;

    if (_minuteAngle/2.0 >M_PI) {

        _minuteAngle =0;

    }

    _watchImageView.minuteView.transform =CGAffineTransformMakeRotation(_minuteAngle);

    _hourAngle +=M_PI/43200;

    if (_hourAngle/2.0 >M_PI) {

        _hourAngle =0;

    }

    _watchImageView.hourView.transform =CGAffineTransformMakeRotation(_hourAngle);

}

钟表效果

标签：钟表   cgaffinetransformmak   transform   

原文地址：http://blog.csdn.net/oik_ios/article/details/47779041