[英]Potential leak of an object stored into 'imageCrop'
该代码运行正常,但是在分析时显示潜在的内存泄漏。 看来imageCrop有潜在的内存泄漏。 非常感谢您的帮助。
这是我的代码。
-(CATransformLayer *)transformLayerFromImage:(UIImage *)image Frame:(CGRect)frame Duration:(CGFloat)duration AnchorPiont:(CGPoint)anchorPoint StartAngle:(double)start EndAngle:(double)end
{
CATransformLayer *jointLayer = [CATransformLayer layer];
jointLayer.anchorPoint = anchorPoint;
CALayer *imageLayer = [CALayer layer];
CAGradientLayer *shadowLayer = [CAGradientLayer layer];
double shadowAniOpacity;
if (anchorPoint.y == 0.5) {
CGFloat layerWidth;
if (anchorPoint.x == 0 ) //from left to right
{
layerWidth = image.size.width - frame.origin.x;
jointLayer.frame = CGRectMake(0, 0, layerWidth, frame.size.height);
if (frame.origin.x) {
jointLayer.position = CGPointMake(frame.size.width, frame.size.height/2);
}
else {
jointLayer.position = CGPointMake(0, frame.size.height/2);
}
}
else { //from right to left
layerWidth = frame.origin.x + frame.size.width;
jointLayer.frame = CGRectMake(0, 0, layerWidth, frame.size.height);
jointLayer.position = CGPointMake(layerWidth, frame.size.height/2);
}
//map image onto transform layer
imageLayer.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
imageLayer.anchorPoint = anchorPoint;
imageLayer.position = CGPointMake(layerWidth*anchorPoint.x, frame.size.height/2);
[jointLayer addSublayer:imageLayer];
CGImageRef imageCrop = CGImageCreateWithImageInRect(image.CGImage, frame);
imageLayer.contents = (__bridge id)imageCrop;
imageLayer.backgroundColor = [UIColor clearColor].CGColor;
//add shadow
NSInteger index = frame.origin.x/frame.size.width;
shadowLayer.frame = imageLayer.bounds;
shadowLayer.backgroundColor = [UIColor darkGrayColor].CGColor;
shadowLayer.opacity = 0.0;
shadowLayer.colors = [NSArray arrayWithObjects:(id)[UIColor blackColor].CGColor, (id)[UIColor clearColor].CGColor, nil];
if (index%2) {
shadowLayer.startPoint = CGPointMake(0, 0.5);
shadowLayer.endPoint = CGPointMake(1, 0.5);
shadowAniOpacity = (anchorPoint.x)?0.24:0.32;
}
else {
shadowLayer.startPoint = CGPointMake(1, 0.5);
shadowLayer.endPoint = CGPointMake(0, 0.5);
shadowAniOpacity = (anchorPoint.x)?0.32:0.24;
}
}
else{
CGFloat layerHeight;
if (anchorPoint.y == 0 ) //from top
{
layerHeight = image.size.height - frame.origin.y;
jointLayer.frame = CGRectMake(0, 0, frame.size.width, layerHeight);
if (frame.origin.y) {
jointLayer.position = CGPointMake(frame.size.width/2, frame.size.height);
}
else {
jointLayer.position = CGPointMake(frame.size.width/2, 0);
}
}
else { //from bottom
layerHeight = frame.origin.y + frame.size.height;
jointLayer.frame = CGRectMake(0, 0, frame.size.width, layerHeight);
jointLayer.position = CGPointMake(frame.size.width/2, layerHeight);
}
//map image onto transform layer
imageLayer.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
imageLayer.anchorPoint = anchorPoint;
imageLayer.position = CGPointMake(frame.size.width/2, layerHeight*anchorPoint.y);
[jointLayer addSublayer:imageLayer];
CGImageRef imageCrop = CGImageCreateWithImageInRect(image.CGImage, frame);
imageLayer.contents = (__bridge id)imageCrop;
imageLayer.backgroundColor = [UIColor clearColor].CGColor;
//add shadow
NSInteger index = frame.origin.y/frame.size.height;
shadowLayer.frame = imageLayer.bounds;
shadowLayer.backgroundColor = [UIColor darkGrayColor].CGColor;
shadowLayer.opacity = 0.0;
shadowLayer.colors = [NSArray arrayWithObjects:(id)[UIColor blackColor].CGColor, (id)[UIColor clearColor].CGColor, nil];
if (index%2) {
shadowLayer.startPoint = CGPointMake(0.5, 0);
shadowLayer.endPoint = CGPointMake(0.5, 1);
shadowAniOpacity = (anchorPoint.x)?0.24:0.32;
}
else {
shadowLayer.startPoint = CGPointMake(0.5, 1);
shadowLayer.endPoint = CGPointMake(0.5, 0);
shadowAniOpacity = (anchorPoint.x)?0.32:0.24;
}
}
[imageLayer addSublayer:shadowLayer];
//animate open/close animation
CABasicAnimation* animation = (anchorPoint.y == 0.5)?[CABasicAnimation animationWithKeyPath:@"transform.rotation.y"]:[CABasicAnimation animationWithKeyPath:@"transform.rotation.x"];
[animation setDuration:duration];
[animation setFromValue:[NSNumber numberWithDouble:start]];
[animation setToValue:[NSNumber numberWithDouble:end]];
[animation setRemovedOnCompletion:NO];
[jointLayer addAnimation:animation forKey:@"jointAnimation"];
//animate shadow opacity
animation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[animation setDuration:duration];
[animation setFromValue:[NSNumber numberWithDouble:(start)?shadowAniOpacity:0]];
[animation setToValue:[NSNumber numberWithDouble:(start)?0:shadowAniOpacity]];
[animation setRemovedOnCompletion:NO];
[shadowLayer addAnimation:animation forKey:nil];
return jointLayer;
}
使用CGImageCreateWithImageInRect
创建的CGImageCreateWithImageInRect
都应释放,因为这是来自非托管内存区域的函数。
使用CGImageRelease
释放对非托管对象的引用:
CGImageRelease(imageCrop); imageCrop = NULL;
要么
使用__bridge_transfer
而不是__bridge
将对象所有权通过CGImageRef
传输到ARC。
imageLayer.contents = (__bridge_transfer id)imageCrop;
在这种情况下,ARC将为您高效地执行第一。
好读:
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