Question

我在论坛上的第一篇文章，但我一直在使用过去几个月发布的答案，并找到非常有用的答案！我还在学习目标c并且还在学习一些基础知识。

我的代码是几百行，所以我不想发布整个代码。代码的基本前提是将一系列随机图像加载到屏幕上的随机位置。

当我试图找出如何处理这个想法时，我做了一个简单的测试版本，当按下按钮时会添加一个气球，然后当你点击pop气球时删除所有创建的气球图像。

这个气球代码运行得很好，然后我将这个相同的概念添加到我的主代码中。但是现在当我只使用更大规模的代码时，代码将冻结在99％的CPU使用率和18.5 MB内存。代码永远不会失败，但会被冻结。较大的版本基本上只是在按下按钮时添加多个气球而不是一个。有时多达15张图片。

这种风格的代码是否有任何原因无法在更大规模上运作？或者，当代码冻结并且没有给出错误时，如何解决问题。

.h文件

@interface ViewController : UIViewController
{
    // Holds an array of images of the balloons
    NSMutableArray *BalloonArray;

    // Holds an array file names of the balloon PNG files
    NSMutableArray *BalloonNames;
}

-(void)AddBalloon:(id)sender;
-(void)PopBalloons:(id)sender;

@end

.m文件

@interface ViewController ()

@end

@implementation ViewController

-(void)viewDidLoad
{
    // Allocates memory for the array
    BalloonArray = [[NSMutableArray alloc] init];

    // Allocates memory and inputs the names of the images
    BalloonNames = [NSMutableArray arrayWithObjects:[UIImage imageNamed:@"pink.png"],[UIImage imageNamed:@"blue.png"],[UIImage imageNamed:@"green.png"], nil];

    [super viewDidLoad];
}

-(void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

-(void)AddBalloon:(id)sender
{
    int x;  // x position of the balloon image created
    int y;  // y position of the balloon image created
    int i;  // Random index value to pull a random balloon image out

    // Random number generator for the x and y position
    x = arc4random_uniform(230) + 30;
    y = arc4random_uniform(400) + 150;

    // Random index value from 0 to 2
    // Random based on how many images there are to chose from
    i = arc4random_uniform(3);

    // Uses the image from the index value previously randomnized
    UIImage *Balloon = [BalloonNames objectAtIndex:i];

    // Places the UIImage in a UIImageView
    UIImageView *BalloonView = [[UIImageView alloc] initWithImage:Balloon];

    // Sizes the image to the correct size
    BalloonView.frame = CGRectMake(0, 0, 50, 100);

    // Centers the image using the x and y coordinates
    BalloonView.center = CGPointMake(x,y);

    // Adds the image view to the view
    [self.view addSubview:BalloonView];

    // Adds the image view to the array
    [BalloonArray addObject:BalloonView];
}

-(void)PopBalloons:(id)sender
{
    // Removes each image in the array out of the main view
    for(UIImageView *Test in BalloonArray)
    {
        [Test removeFromSuperview];
    }

    // Removes all object from the array
    [BalloonArray removeAllObjects];
}

@end

Answer 1

使方法-(void)AddBalloon:(id)sender在单独的线程上运行。也许你可以使用[NSThread detachNewThreadSelector:@selector(myThreadMainMethod:) toTarget:self withObject:nil];。看看Apple Documentation

目标C：加载一系列图像时代码冻结

1 个答案: