目的C：加載一系列圖片時代碼凍結

Question

我的第一篇文章發佈到論壇，但我一直在使用過去幾個月發佈的答案，並找到非常有用的答案！我仍然在學習目標c並仍在學習一些基礎知識。

我的代碼是幾百行，所以我不想發佈整個代碼。代碼的基本前提是將一系列隨機圖像加載到屏幕上的隨機位置。

當我試圖弄清楚如何處理這個想法時，我做了一個簡單的測試版本，當按下按鈕時會添加一個氣球，然後當您彈出氣球時刪除所有創建的氣球圖像。

這個氣球代碼工作得很好，然後我把這個相同的概念添加到我的主代碼。但是現在，當我僅使用更大的規模時，代碼將凍結在99％cpu使用率和18.5 MB內存。代碼永遠不會失敗，但會被凍結。較大的版本基本上只是在按下按鈕而不是一個按鈕時添加多個氣球。有時多達15個圖像。

是否有任何理由這種風格的代碼不會在更大的規模上工作？或者當代碼凍結並且沒有給出錯誤時，如何解決問題。

.h文件中

@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

使該方法-(void)AddBalloon:(id)sender到一個單獨的線程運行。也許你可以使用[NSThread detachNewThreadSelector:@selector(myThreadMainMethod:) toTarget:self withObject:nil];。看看Apple Documentation