降低应用程序的CPU使用率 [英] Lower the CPU usage of an app

问题描述

我在使用CPU时遇到问题.当我启动我的应用程序时，其动画开始播放的速度很快，突然的动画速度降低了，然后崩溃了.但是，当我使用Activity Monitor(Instrument)检查该应用程序时，我的应用程序使用的CPU大约占80％-90％.我无法降低CPU使用率.

I am having an issue with CPU usage. When I starts my app its animation starts at good speed and all of sudden animation speed gets lower down and then app gets crashed. But when I checked the app with Activity Monitor(Instrument) my app use CPU near about 80%-90%. I am unable reduce the CPU usage.

代码:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{   

    CGPoint location;

    UITouch *touch = [[event allTouches] anyObject];
    location = [touch locationInView:self.view];



}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{

    CGPoint location;

    UITouch *touch = [[event allTouches] anyObject];
    location = [touch locationInView:self.view];

    touchMovedX = location.x;
    touchMovedY = location.y; 

   [self merge];
}  





 // -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
    //{
       // [self merge];
   // }


-(void)merge
{

    CGSize size = CGSizeMake(320, 480);
    UIGraphicsBeginImageContext(size);

    CGPoint point1 = CGPointMake(0,0);

    CGPoint point2 = CGPointMake(touchMovedX,touchMovedY);

    UIImage *imageOne = [UIImage imageNamed:@"iphone.png"];
    [imageOne drawAtPoint:point1];

    UIImage *imageTwo = [UIImage imageNamed:@"Cloud.png"];

    [imageTwo drawAtPoint:point2];

    imageB.image=imageTwo;

    UIImage *imageC = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,320,480)];
    imageview.image=imageC;

    [self.view addSubview:imageview];
}

-(IBAction)save:(id)sender  {

UIImage* imageToSave = imageview.image;

UIImageWriteToSavedPhotosAlbum(imageToSave, nil, nil, nil);
[imageToSave release];

}

任何帮助都是有意义的.

Any help would be appreciable.

谢谢

推荐答案

-(void)viewDidAppear:(BOOL)animated{
    UIPanGestureRecognizer *pgr1 = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(image1Moved:)];
    [iv1 addGestureRecognizer:pgr1];

}

-(void)image1Moved:(UIPanGestureRecognizer *)pgr{
    NSLog(@"Came here");
     [iv1 setCenter:[pgr locationInView:self.view]];
}

做类似上面的事情.您可以在其中移动imageview的位置.

Do some thing like the above. Where you can move the imageview.

也可以使用另一个按钮调用合并，您可以在其中随意移动图像，但是当需要合并时，请单击一个按钮.这样，您将只调用一次Merge，并且不会对CPU造成任何负担.

Also, call the merge using another button, where you move the image at will, but when it is time to merge, click a button. That way, you will call Merge only once and it will not be any load on the CPU.

您好像是个初学者，我强烈建议您遵循一些教程并了解更多有关

Looks like you are a beginner and I would highly recommend that you follow some tutorials and learn some more about

1. 实例变量
2. 属性
3. 手势识别器等

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