iPhone应用程序性能正在降低，没有任何内存泄漏？

问题描述

| 我有一个iPhone绘图应用程序，当我使用喷雾罐工具时，它的运行速度在减慢。但是，当我通过运行带有泄漏的应用程序来检查泄漏时，没有显示泄漏。所有其他工具都可以正常工作，可以帮助我解决该问题。   我的喷雾罐工具类代码如下：

    - init {
    if ((self = [super init])) 
    { 
        trackingtouches = [[NSMutableArray array] retain]; 
        startPoints = [[NSMutableArray array] retain]; 
        paths = [[NSMutableArray array] retain];
    } 
    return self;
}

- (void)activate { } - (void)deactivate {

    [trackingtouches removeAllObjects]; 
    [startPoints removeAllObjects]; 
    [paths removeAllObjects];

} 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
        //  UIView *touchedView = [delegate viewForUseWithTool:self];
    UITouch *thetouch = [touches anyObject];
    UIView *touchedView = [delegate viewForUseWithTool:self]; 
    endPoint = [thetouch locationInView:touchedView];

    for (UITouch *touch in [event alltouches]) {
        // CGFloat linewidth=10;

            // remember the touch,and its original start point,for future
        [trackingtouches addobject:touch];
        CGPoint location = [touch locationInView:touchedView];
        [startPoints addobject:[NSValue valueWithCGPoint:location]];
        UIBezierPath *path = [UIBezierPath bezierPath];

        path.lineCapStyle = kCGLineCapRound;
        [path movetoPoint:location];
        [path setlinewidth:delegate.strokeWidth];
        [path addLinetoPoint:location];
        [paths addobject:path];
    }   
} 

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [self deactivate];
} 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
//  UITouch *thetouch = [touches anyObject];
//  UIView *touchedView = [delegate viewForUseWithTool:self]; 
        //endPoint = [thetouch locationInView:touchedView];

    for (UITouch *touch in [event alltouches]) 
    { // make a line from the start point to the current point 
        NSUInteger touchIndex = [trackingtouches indexOfObject:touch]; 
            // only if we actually remember the start of this touch... 
        if (touchIndex != NSNotFound) {
            UIBezierPath *path = [paths objectAtIndex:touchIndex];
            PathDrawingInfo *info = [PathDrawingInfo pathDrawingInfoWithPath:path fillColor:[UIColor clearColor] strokeColor:delegate.strokeColor];
            [delegate addDrawable:info];
            [trackingtouches removeObjectAtIndex:touchIndex];
            [startPoints removeObjectAtIndex:touchIndex];
            [paths removeObjectAtIndex:touchIndex];
        }
    } 
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
        //  UIView *touchedView = [delegate viewForUseWithTool:self]; 
    UITouch *thetouch = [touches anyObject];
    UIView *touchedView = [delegate viewForUseWithTool:self]; 
    currentpoint = [thetouch locationInView:touchedView];
        //currentpoint.y -=20;
        //[self drawCircle];
    for (UITouch *touch in [event alltouches]) {
        CGFloat linewidth=10;

            // make a line from the start point to the current point 
        NSUInteger touchIndex = [trackingtouches indexOfObject:touch]; 
        UIBezierPath *path = [UIBezierPath bezierPath];
        if (touchIndex != NSNotFound) {
            // CGPoint location = [touch locationInView:touchedView]; 
            UIBezierPath *path = [paths objectAtIndex:touchIndex]; UIBezierPath *circle = [UIBezierPath bezierPathWithovalInRect:CGRectMake((currentpoint.x-linewidth),( currentpoint.y-linewidth),linewidth*2,linewidth*2)];
        NSInteger i,x,y;
        NSInteger modNumber =5*(int)linewidth;
        for (i = 0; i < (linewidth*linewidth)/2; i++) {
            do {
                x = (random() % modNumber)+currentpoint.x - linewidth*2;
                y = (random() % modNumber)+currentpoint.y - linewidth*2;
            } while (![circle containsPoint:CGPointMake(x,y)]);

            [path appendpath:[UIBezierPath bezierPathWithRect:CGRectMake(x,y,0.0025,0.0025)]];
        }

        [path movetoPoint:currentpoint];
        [path setlinewidth:delegate.strokeWidth];
        [path addLinetoPoint:currentpoint];
                    // only if we actually remember the start of this touch... 
        }  
         [paths addobject:path];;

    } 
}
- (void)drawTemporary {
    for (UIBezierPath *path in paths) { 
        [delegate.strokeColor setstroke]; 
        [path stroke];
    }
}
- (void)dealloc {
    [trackingtouches release]; 
trackingtouches = nil; 
[startPoints release]; 
startPoints = nil; 
[paths release]; 
paths = nil;
self.delegate = nil;
    [super dealloc];
}

    

解决方法

在h块中定义属性，并在m块中进行合成。

@property (nonatomic,retain) NSMutableArray *trackingTouches;

@property (nonatomic,retain) NSMutableArray *startPoints; 

@property (nonatomic,retain) NSMutableArray *paths;

@synthesize trackingTouches,startPoints,paths;

并像这样使用dealloc块

    - (void)dealloc {
         [self setTrackingTouches:nil]; 
     [self setStartPoints:nil];
     [self setPaths:nil];
     self.delegate = nil;
         [super dealloc];
}

    ,不要使用UIBezierPath。用普通的Core Graphics函数创建一个CGMutablePathRef。