Cocoa touch 将两个UIImageView旋转360度

我一直在尝试两个固定大小的UIImageView，上面有图像（覆盖所有视图），但我一直在努力（我放弃！）以循环方式旋转每个视图。因此，如果我有一个UIView，另一个就在它旁边，我希望能够旋转第一个UIView（另一个是中间的，没有间隙），然后以360度的方式旋转，这是不可能的

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有人能帮我吗？

我写的第一段iPhone代码中有一段是显示一个用树叶做成的时钟

一个时钟是由三片叶子，小时，分钟和秒组成的，我们有一个单一的叶子图像，它是用不同的比例，不透明度等绘制的，以给出时钟的外观

下面的UIView在视图的中心绘制了一个时钟，通过平移和缩放将树叶放置在正确的位置。保存并还原CTM以保存重复翻译

您可能想看看它是否有助于您处理坐标系和旋转

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) 
    {
        // Initialization code
        self.minutes = 49;
        self.seconds = 0;

        // clear to transparent
        self.clearsContextBeforeDrawing = YES;
        self.backgroundColor = [UIColor clearColor];

        [self tick:nil];
    }
    return self;
}

- (void)tick:(NSTimer *)timer
{
    // get time
    NSDate * time = [NSDate date];
    NSCalendar * gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents * comp = [gregorian components:NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:time];

    // update the time
    self.seconds = [comp second];
    self.minutes = [comp minute];
    self.hours = [comp hour];

    // redisplay
    [self setNeedsDisplay];
}

- (float)toRadians:(float)deg
{
    return deg * 3.14/180.0;
}

- (void)drawClock:(CGPoint)pos hours:(NSInteger)theHours minutes:(NSInteger)theMinutes seconds:(NSInteger)theSeconds
{
    UIImage * leaf = [UIImage imageNamed:@"leaf.png"];

    // context
    CGContextRef myContext = UIGraphicsGetCurrentContext();

    // save original state
    CGContextSaveGState(myContext);

    // set alpha and move it to centre of clock
    CGContextSetAlpha(myContext, 0.8);
    CGContextTranslateCTM (myContext, pos.x, pos.y);

    // save centred state
    CGContextSaveGState(myContext);

    // rotate and translate the hour 'hand'
    CGContextRotateCTM (myContext, [self toRadians:(theHours-3.0+theMinutes/60.0)*360/12.0 - 10] );
    CGContextTranslateCTM (myContext, -5, -[leaf size].height/12);

    // draw the hour hand and restore to translated
    CGContextDrawImage(myContext, CGRectMake(0, 0, [leaf size].width/6, [leaf size].height/6), [leaf CGImage]);

    // restore centred state and resave
    CGContextRestoreGState(myContext);
    CGContextSaveGState(myContext);

    // rotate and transform the minute 'hand'
    CGContextRotateCTM (myContext, [self toRadians:((theMinutes-15)*360.0 /60.0) - 10]);
    CGContextTranslateCTM (myContext, -5, -[leaf size].height/10);

    // draw the minute hand and restore original context
    CGContextDrawImage(myContext, CGRectMake(0, 0, [leaf size].width/5, [leaf size].height/5), [leaf CGImage]);

    // restore centred state
    CGContextRestoreGState(myContext);

    // rotate and transform the second 'hand'
    CGContextSetAlpha(myContext, 0.5);
    CGContextRotateCTM (myContext, [self toRadians:((theSeconds-15)*360 /60.0) - 10]);
    CGContextTranslateCTM (myContext, -5, -[leaf size].height/10);

    // draw the second hand and restore original context
    CGContextDrawImage(myContext, CGRectMake(0, 0, [leaf size].width/5, [leaf size].height/5), [leaf CGImage]);
    CGContextRestoreGState(myContext);
}

- (void)drawRect:(CGRect)rect
{
    // draw clock in clock view
    [self drawClock:CGPointMake(rect.size.width/2,rect.size.height/2) hours:self.hours minutes:self.minutes seconds:self.seconds];

    // test code for centering hands
//  [self drawClock:CGPointMake(rect.size.width/2,rect.size.height/2) hours:12 minutes:00 seconds:00];
}