内存泄漏UITableView [英] Memory Leak UITableView
问题描述
解决方案
只需阅读 @Kjuly
非常感谢
问题
我使用带有部分的tableView，每个部分有4行，第一行必须显示我使用过的网站的图像 HJCache 类可缓存图像并避免泄漏/内存问题.
I used tableView with sections, each section has 4 rows, the first row it must show image from website which I used HJCache class to cache the image and avoid leaking/memory issues.
现在，此代码可以正常工作，并且在我快速滚动时不会泄漏或导致内存问题
now, this code it works well and while I am scrolling fast it doesn't leak or make memory issue
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//UITableViewCell *cell=nil;
if (indexPath.row == 0) {
static NSString *CellIdentifier = @"Cell";
HJManagedImageV* mi;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
mi = [[HJManagedImageV alloc] initWithFrame:CGRectMake(0,0,cell.frame.size.width, 310)];
mi.tag = 999;
[cell addSubview:mi];
} else {
mi = (HJManagedImageV*)[cell viewWithTag:999];
[mi clear];
}
if (indexPath.row == 0) {
mi.image = [UIImage imageNamed:@"placeholder"];
mi.url = [NSURL URLWithString:[pictures objectAtIndex:indexPath.section]];
[objMan manage:mi];
UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(likeTappedDouble:)];
tapped.numberOfTapsRequired = 2;
[mi setUserInteractionEnabled:YES];
[mi addGestureRecognizer:tapped];
}
return cell;
}
}
但是，当我尝试配置其他行时，它会泄漏，并且在滚动应用程序时会出现内存问题，而且速度非常慢.
But when I try to configure other rows it leaked and while scrolling the application make memory issue and be very slowly.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//UITableViewCell *cell=nil;
if (indexPath.row == 0) {
static NSString *CellIdentifier = @"Cell";
HJManagedImageV* mi;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
mi = [[HJManagedImageV alloc] initWithFrame:CGRectMake(0,0,cell.frame.size.width, 310)];
mi.tag = 999;
[cell addSubview:mi];
} else {
mi = (HJManagedImageV*)[cell viewWithTag:999];
[mi clear];
}
if (indexPath.row == 0) {
mi.image = [UIImage imageNamed:@"placeholder"];
mi.url = [NSURL URLWithString:[pictures objectAtIndex:indexPath.section]];
[objMan manage:mi];
UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(likeTappedDouble:)];
tapped.numberOfTapsRequired = 2;
[mi setUserInteractionEnabled:YES];
[mi addGestureRecognizer:tapped];
}
return cell;
}
static NSString *CellIdentifier = @"CellS";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
if (indexPath.row == 1) {
// configure row 1
}
if (indexPath.row == 2) {
// configure row 2
}
// etc for the others ..
return cell;
}
问题出在哪里，谢谢.
更新
此代码无法正常运行，它会在滚动时在另一行添加子视图
This code doesn't work well, it add the subview in other row while scrolling
static NSString *CellIdentifier = @"CellS";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
if (indexPath.row == 1) {
UIImage* likesimage = [UIImage imageNamed:@"likespic"];
CGRect frameimg = CGRectMake(7, 5, likesimage.size.width, likesimage.size.height);
likesbutton = [[UIButton alloc] initWithFrame:frameimg];
[likesbutton setBackgroundImage:likesimage forState:UIControlStateNormal];
likesbutton.backgroundColor = [UIColor clearColor];
[cell addSubview:likesbutton];
label3 = [[UILabel alloc] initWithFrame:CGRectMake(20, 2, 100, 20)];
label3.textColor = [UIColor colorWithRed:61.0/255.0 green:113.0/255.0 blue:154.0/255.0 alpha:1.0];
label3.backgroundColor = [UIColor clearColor];
label3.font = [UIFont fontWithName:@"Helvetica-Bold" size:12];
label3.adjustsFontSizeToFitWidth = YES;
[cell addSubview:label3];
}
}
推荐答案
对于其他单元格，您需要重新使用该单元格:
For your other cells, you need to reuse the cell either:
static NSString *CellIdentifier = @"CellS";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
针对已更新的问题进行
您需要了解单元重用"的工作方式.至于您更新的代码，它说只有第1行需要像图像这样的子视图，对吗?因此，您需要将其添加到if (cell == nil){}代码段之外，例如下面的代码:
EDIT for Updated Question:
You need to know how "cell reusing" works. As for your updated code, it said only row 1 needs the subviews like image, right? So you need add it outside of the if (cell == nil){} snippet, like the code below:
static NSString *CellIdentifier = @"CellS";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
if (indexPath.row == 1) {
UIImage* likesimage = [UIImage imageNamed:@"likespic"];
CGRect frameimg = CGRectMake(7, 5, likesimage.size.width, likesimage.size.height);
likesbutton = [[UIButton alloc] initWithFrame:frameimg];
[likesbutton setBackgroundImage:likesimage forState:UIControlStateNormal];
likesbutton.backgroundColor = [UIColor clearColor];
[cell addSubview:likesbutton];
label3 = [[UILabel alloc] initWithFrame:CGRectMake(20, 2, 100, 20)];
label3.textColor = [UIColor colorWithRed:61.0/255.0 green:113.0/255.0 blue:154.0/255.0 alpha:1.0];
label3.backgroundColor = [UIColor clearColor];
label3.font = [UIFont fontWithName:@"Helvetica-Bold" size:12];
label3.adjustsFontSizeToFitWidth = YES;
[cell addSubview:label3];
}
注意:最好像创建第0行一样创建一个新的单元格实例，因为只需要创建一次即可.
Note: It's better to create a new cell instance like what you did for row 0, cause it's only need to be created once.
这篇关于内存泄漏UITableView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
