4

我试图在 xcode 中使用简单的单视图应用程序将图像旋转一圈。我在主故事板上有一个圆形图像和一个按钮。我使用下面的代码，但圆形图像向右漂移，然后在旋转时回到左侧。我不确定它缺少什么。

谢谢你的帮助。

视图控制器.h

#import <UIKit/UIKit.h>

 @interface ViewController : UIViewController
 {
         IBOutlet UIImageView *theImageView;
         IBOutlet UIButton    *theButton;
         NSTimer              *theTimer;
         float        angle;
         BOOL         runStop;
     }


 @property (atomic, retain) IBOutlet UIImageView *theImageView;
 @property (atomic, retain) IBOutlet UIButton    *theButton;

 -(IBAction)runRoulette:(id)sender;

 @end

视图控制器.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize theButton, theImageView;


- (void)viewDidLoad
{
    angle = 0;
    runStop = FALSE;
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)rotateRoulette
{
    theImageView.center = CGPointMake(self.theImageView.center.x, self.theImageView.center.y);
    theImageView.transform=CGAffineTransformMakeRotation (angle);
    angle+=0.001;
}


-(IBAction)runRoulette:(id)sender
{
    if(!runStop)
    {
        theTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/600.0 target:self selector:@selector(rotateRoulette) userInfo:nil repeats:YES];
    }
    else
    {
        [theTimer invalidate];
        theTimer = nil;
    }
    runStop = !runStop;
}
@end
4

1 回答 1

2

我找到了一种非常简单的方法来让我的动画按照我想要的方式工作 -

theImageView.center = CGPointMake(160.0, 364.0);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:5];
//theImageView.center=CGPointMake(self.theImageView.center.x, self.theImageView.center.y);
theImageView.transform = CGAffineTransformMakeRotation(M_PI/2.65);
[UIView commitAnimations];

它旋转 theImageView M_PI/2.65（M_PI/2.65 是 roataion 数量）计数为 5。

于 2013-01-14T00:25:23.640 回答