我有一个动画时钟，目前有内存泄漏。我现在似乎能够把东西放在图像的顶部，但不要把它拿走或者必须清除它（除了重绘整个时钟以便秒针不在两个不同的位置）。
用于清除时钟组件的代码是：
for(UIView *image in self.toWipe)
{
[image removeFromSuperview];
}
[self.toWipe removeAllObjects];
绘制秒针的代码（小时和分钟的处理相同）是：
CGAffineTransform secondTransform = CGAffineTransformMakeTranslation(centerX, centerY);
secondTransform = CGAffineTransformTranslate(secondTransform, -10, -189);
secondTransform = CGAffineTransformRotate(secondTransform, seconds / 60.0 * M_PI * 2.0);
UIImageView *secondHandView = [[UIImageView alloc] initWithImage:secondHandImage];
secondHandView.transform = secondTransform;
[self.view addSubview:secondHandView];
[self.toWipe addObject:secondHandView];
[self.toWipe addObject:secondHandImage];
我已经屏蔽了所画的秒针，并没有通过在每次迭代时绘制钟面来擦除自己;如果我不那样做，那么秒针（或其他人）会扫出越来越多的馅饼，直到它们达到360°的填充盘。记忆力缓慢但稳定地增长，而秒针的动作则变得更加崎岖。
我是否可以或应该做些什么来将遗弃的物品交给遗忘？我在这个项目中使用ARC;我想知道我还能提供更多或不同的内容，以便修复内存泄漏。
谢谢，
- 编辑 -
以下内容是方法正文，其中有一篇文章没有注释掉。它没有解决异常问题，并且不会从正文中的任何内容中引发异常：
int height = floor([[UIScreen mainScreen] bounds].size.height + .4);
int width = floor([[UIScreen mainScreen] bounds].size.width + .4);
UIImage *backgroundImage = nil;
if (height == 2048 || height == 2008 || height == 1024 || height == 1004 || height == 984)
{
if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Portrait.png"];
}
else
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Landscape.png"];
}
}
else if (height == 1536 || height == 768 || height == 748 || height == 728)
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Landscape.png"];
}
else if (height == 1136 || height == 1116 || height == 1096)
{
if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{
backgroundImage = [UIImage imageNamed:@"Background-Default-568.png"];
}
else
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Rotated-568.png"];
}
}
else if (height == 960 || height == 940 || height == 920 || height == 480 || height == 460 || height == 440)
{
if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{
backgroundImage = [UIImage imageNamed:@"Background-Default.png"];
}
else
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Rotated.png"];
}
}
else if ((height == 640 || height == 620 || height == 600) && (width == 1136 || width == 1116 || width == 1096))
{
backgroundImage = [UIImage imageNamed:@"Background-Rotated-568.png"];
}
else if ((height == 640 || height == 620 || height == 600 || height == 320 || height == 300 || height == 280) && (width == 960 || width == 940 || width == 920 || width == 480 || width == 470 || width == 410))
{
if (UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Portrait.png"];
}
else
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Rotated.png"];
}
}
else
{
backgroundImage = [UIImage imageNamed:@"Background-Default-Portrait.png"];
}
backgroundImage = [UIImage imageNamed:@"Background-Default-Landscape.png"];
if (!UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation))
{
int juggle = height;
height = width;
width = juggle;
}
NSUInteger centerX = width * .5;
NSUInteger centerY = height * .5;
CGRect containerRect = CGRectZero;
containerRect.size = [[UIScreen mainScreen] bounds].size;
for(UIView *image in self.toWipe)
{
[image removeFromSuperview];
}
[self.toWipe removeAllObjects];
self.view.backgroundColor = [UIColor colorWithPatternImage:backgroundImage];
// UIView *background = [UIImage imageNamed:@"Background-Default-Landscape.png"];
UIImageView *backgroundView = [[UIImageView alloc] initWithImage:backgroundImage];
[self.view addSubview:backgroundView];
[self.toWipe addObject:backgroundView];
self.containerView = [[UIView alloc] initWithFrame:containerRect];
// float hours = 5.0;
// float minutes = 19.0;
// float seconds = 312.0;
// int timeStampMilliseconds = (ceil([[NSDate date] timeIntervalSince1970] * 1000.0));
// double timeStampMilliseconds = [[NSDate date] timeIntervalSince1970] * 1000.0;
double timeStampMilliseconds = CACurrentMediaTime() * 1000;
double hours = fmodf(timeStampMilliseconds, 86400000) / 3600000.0;
double minutes = fmodf(timeStampMilliseconds, 3600000) / 60000.0;
double seconds = fmodf(timeStampMilliseconds, 60000) / 1000.0;
// NSLog(@"Milliseconds: %lf, Hours: %lf, minutes: %lf, seconds: %lf", timeStampMilliseconds, hours, minutes, seconds);
[self.containerView removeFromSuperview];
self.containerView = [[UIView alloc] initWithFrame:containerRect];
UIImage *hourHandImage = [UIImage imageNamed:@"hour-hand.png"];
UIImageView *hourHandView = [[UIImageView alloc] initWithImage:hourHandImage];
hourHandImage = [UIImage imageNamed:@"hour-hand.png"];
hourHandView = [[UIImageView alloc] initWithImage:hourHandImage];
[self.view addSubview:hourHandView];
// UIImage *dotImage = [UIImage imageNamed:@"dot.png"];
// UIImageView *dotView = [[UIImageView alloc] initWithImage:dotImage];
// dotView.transform = CGAffineTransformMakeTranslation(centerX, centerY);
// [self.view addSubview:dotView];
hourHandView.layer.anchorPoint = CGPointMake(0.5f, 0.5f);
CGAffineTransform hourTransform = CGAffineTransformMakeTranslation(centerX, centerY);
hourTransform = CGAffineTransformTranslate(hourTransform, -22, -122);
hourTransform = CGAffineTransformRotate(hourTransform, hours / 12.0 * M_PI * 2.0);
CGAffineTransform minuteTransform = CGAffineTransformMakeTranslation(centerX, centerY);
minuteTransform = CGAffineTransformTranslate(minuteTransform, -10, -182);
minuteTransform = CGAffineTransformRotate(minuteTransform, minutes / 60.0 * M_PI * 2.0);
// hourTransform = CGAffineTransformTranslate(hourTransform, -sin(angle) * 50 + 122 , -cos(angle) * 50 + 122);
// hourTransform = CGAffineTransformTranslate(hourTransform, -330, 330);
hourHandView.transform = hourTransform;
[self.toWipe addObject:hourHandImage];
[self.toWipe addObject:hourHandView];
UIImage *minuteHandImage = [UIImage imageNamed:@"minute-hand.png"];
UIImageView *minuteHandView = [[UIImageView alloc] initWithImage:minuteHandImage];
minuteHandView.transform = minuteTransform;
[self.view addSubview:minuteHandView];
[self.toWipe addObject:minuteHandView];
[self.toWipe addObject:minuteHandImage];
minuteTransform = CGAffineTransformRotate(minuteTransform, minutes / 60.0 * M_PI * 2.0);
UIImage *secondHandImage = [UIImage imageNamed:@"second-hand.png"];
CGAffineTransform secondTransform = CGAffineTransformMakeTranslation(centerX, centerY);
secondTransform = CGAffineTransformTranslate(secondTransform, -10, -189);
secondTransform = CGAffineTransformRotate(secondTransform, seconds / 60.0 * M_PI * 2.0);
UIImageView *secondHandView = [[UIImageView alloc] initWithImage:secondHandImage];
secondHandView.transform = secondTransform;
[self.view addSubview:secondHandView];
[self.toWipe addObject:secondHandView];
[self.toWipe addObject:secondHandImage];
// hourHandView.layer.anchorPoint = CGPointMake(centerX, centerY);
// hourHandView.layer.affineTransform = CGAffineTransformRotate(transform, hour / (12.0 * M_PI * 2.0));
// UIImageView *minuteHandView = [[UIImageView alloc] initWithImage:minuteHandImage];
// UIImageView *secondHandView = [[UIImageView alloc] initWithImage:secondHandImage];
// [self.view addSubview:minuteHandView];
// [self.view addSubview:secondHandView];
答案 0 :(得分：2)
您是否尝试过每秒应用变换而不是一遍又一遍地删除和添加图像视图？
以下是我用于我正在处理的时钟应用程序的代码：
-(void)updateClock
{
NSDateComponents *dateComponents = [[NSCalendar currentCalendar] components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:inDate];
NSInteger seconds = [dateComponents second];
NSInteger minutes = [dateComponents minute];
NSInteger hours = [dateComponents hour];
//NSLog(@"raw: hours:%d min:%d secs:%d", hours, minutes, seconds);
if (hours > 12) hours -=12; //PM
//set angles for each of the hands
CGFloat secAngle = Degrees2Radians(seconds/60.0*360);
CGFloat minAngle = Degrees2Radians(minutes/60.0*360);
CGFloat minAdjustment = minAngle/12.0;
CGFloat hourAngle = Degrees2Radians(hours/12.0*360) + minAdjustment;
//reflect the rotations + 180 degres since CALayers coordinate system is inverted
secHand.transform = CATransform3DMakeRotation (secAngle+M_PI, 0, 0, 1);
minHand.transform = CATransform3DMakeRotation (minAngle+M_PI, 0, 0, 1);
hourHand.transform = CATransform3DMakeRotation (hourAngle+M_PI, 0, 0, 1);
}