【发布时间】：2014-12-17 11:07:27
【问题描述】：
我想以圆形路径为图像视图设置动画，并在单击该图像视图时需要更改新图像。我的问题是我分配给图像视图的图像没有被释放。并且应用程序收到内存警告并崩溃。我浏览并尝试了很多解决这个问题的方法，但没有用。就我而言，我需要从 Objective c 类创建所有 ui 组件。这里贴出创建图像视图和动画的代码。
@autoreleasepool {
for(int i= 0 ; i < categories.count; i++)
{
NSString *categoryImage = [NSString stringWithFormat:@"%@_%ld.png",[categories objectAtIndex:i],(long)rating];
if (paginationClicked) {
if([selectedCategories containsObject:[categories objectAtIndex:i]]){
categoryImage = [NSString stringWithFormat:@"sel_%@",categoryImage];
}
}
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = [self.mySprites objectForKey:categoryImage];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.clipsToBounds = NO;
[imageView sizeToFit];
imageView.accessibilityHint = [categories objectAtIndex:i];
// imageView.frame = CGRectMake(location.x+sin(M_PI/2.5)*(self.view.frame.size.width*1.5),location.y+cos(M_PI/2.5)*(self.view.frame.size.width*1.5) , 150, 150);
imageView.userInteractionEnabled = YES;
imageView.multipleTouchEnabled = YES;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(categoryTapGestureCaptured:)];
singleTap.numberOfTapsRequired = 1;
[imageView addGestureRecognizer:singleTap];
[categoryView addSubview:imageView];
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
UIBezierPath *path = [UIBezierPath bezierPath];
[path addArcWithCenter:location
radius:self.view.frame.size.width*1.5
startAngle:0.8
endAngle:-0.3+(0.1*(i+1))
clockwise:NO];
animation.path = path.CGPath;
imageView.center = path.currentPoint;
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
animation.duration = 1+0.25*i;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
// Apply it
[imageView.layer addAnimation:animation forKey:@"animation.trash"];
}
}
这是在点击时更改图像的代码。
for (UIImageView *subview in subviews) {
NSString *key = [NSString stringWithFormat:@"%@_%ld.png",subview.accessibilityHint,(long)rating];
if ([SelectedCategory isEqualToString:subview.accessibilityHint]) {
NSString *tempSubCategory = [categoryObj objectForKey:SelectedCategory];
if([selectedCategories containsObject:SelectedCategory]){
subview.image = [self.mySprites objectForKey:key];
[selectedCategories removeObject:SelectedCategory];
if (tempSubCategory.length != 0) {
subCategoriesAvailable = subCategoriesAvailable-1;
}
[self showNoPagination:subCategoriesAvailable+2];
}else{
if(selectedCategories.count != 2){
key = [NSString stringWithFormat:@"sel_%@",key];
subview.image = [self.mySprites objectForKey:key];
[selectedCategories addObject:SelectedCategory];
if ([SelectedCategory isEqualToString:@"Other"]) {
[self showCommentDialog];
}else{
if (tempSubCategory.length != 0) {
subCategoriesAvailable = subCategoriesAvailable+1;
}
[self showNoPagination:subCategoriesAvailable+2];
}
}
}
[self disableCategories];
break;
}
}
而且我不知道这里做错了什么。我尝试取消 for 循环，但没有用。
我用于删除图像视图的代码
UIView *categoryView = [self.view viewWithTag:500];
NSArray *subviews = [categoryView subviews];
for (UIImageView *subview in subviews) {
if(![selectedCategories containsObject:subview.accessibilityHint]){
[subview removeFromSuperview];
subview.image = Nil;
}
}
添加精灵阅读器代码以供参考
#import "UIImage+Sprite.h"
#import "XMLReader.h"
@implementation UIImage (Sprite)
+ (NSDictionary*)spritesWithContentsOfFile:(NSString*)filename
{
CGFloat scale = [UIScreen mainScreen].scale;
NSString* file = [filename stringByDeletingPathExtension];
if ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)] &&
(scale == 2.0))
{
file = [NSString stringWithFormat:@"%@@2x", file];
}
NSString* extension = [filename pathExtension];
NSData* data = [NSData dataWithContentsOfFile:[NSString stringWithFormat:@"%@.%@", file,extension]];
NSError* error = nil;
NSDictionary* xmlDictionary = [XMLReader dictionaryForXMLData:data error:&error];
NSDictionary* xmlTextureAtlas = [xmlDictionary objectForKey:@"TextureAtlas"];
UIImage* image = [UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@.%@", file,[[xmlTextureAtlas objectForKey:@"imagePath"]pathExtension]]];
CGSize size = CGSizeMake([[xmlTextureAtlas objectForKey:@"width"] integerValue],
[[xmlTextureAtlas objectForKey:@"height"] integerValue]);
if (!image || CGSizeEqualToSize(size, CGSizeZero)) return nil;
CGImageRef spriteSheet = [image CGImage];
NSMutableDictionary* tempDictionary = [[NSMutableDictionary alloc] init];
NSArray* xmlSprites = [xmlTextureAtlas objectForKey:@"sprite"];
for (NSDictionary* xmlSprite in xmlSprites)
{
CGRect unscaledRect = CGRectMake([[xmlSprite objectForKey:@"x"] integerValue],
[[xmlSprite objectForKey:@"y"] integerValue],
[[xmlSprite objectForKey:@"w"] integerValue],
[[xmlSprite objectForKey:@"h"] integerValue]);
CGImageRef sprite = CGImageCreateWithImageInRect(spriteSheet, unscaledRect);
// If this is a @2x image it is twice as big as it should be.
// Take care to consider the scale factor here.
[tempDictionary setObject:[UIImage imageWithCGImage:sprite scale:scale orientation:UIImageOrientationUp] forKey:[xmlSprite objectForKey:@"n"]];
CGImageRelease(sprite);
}
return [NSDictionary dictionaryWithDictionary:tempDictionary];
}
@end
请帮我解决这个问题。提前致谢。
【问题讨论】：
-
您正在将图像视图添加到类别视图，但从子视图中删除？？这是什么子视图。你在哪里删除显示代码中的图像？？
-
我正在使用 NSArray *subviews = [[self.view viewWithTag:500] subviews];获取类别视图的所有子视图并更改检测到点击手势的图像。
-
好的，那么你在哪里删除图像，我可以看到你正在从数组中删除对象。像 imageView.image = nil;[imageview removeFromSupreView] 这样删除图像和 imageView 的代码在哪里。我猜在点击时您每次都在分配 imageView。如果是这样，在再次分配之前，将图像设为 nil，并从 supreView 中删除 imageView。我猜对了吗？？
-
嗨，我更新了这个问题。请检查我用来删除图像视图的代码。我已经按照你说的做了，没有运气:(
标签： ios memory-management uiimageview automatic-ref-counting