应用程序在发布自定义表格单元时崩溃

Question

当我的自定义 TableViewCell 发布时，我的应用程序崩溃了。

Cell 在cellForRowAtIndexPath 中被初始化如下：

SearchTableViewCell *cell = (SearchTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[SearchTableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}

cell.nameLabel.text = @"some text";
cell.addressLabel.text = @"some more text";

cell 类本身是这样的

#import <UIKit/UIKit.h>

@class EGOImageView;

@interface SearchTableViewCell : UITableViewCell {
    UILabel *nameLabel;
    UILabel *addressLabel;
    EGOImageView *imageView;
}

@property (nonatomic, retain) UILabel *nameLabel;
@property (nonatomic, retain) UILabel *addressLabel;

- (UILabel *)labelWithColor:(UIColor*)color selectedColor:(UIColor*)selectedColor fontSize:(CGFloat)fontSize bold:(BOOL)bold frame:(CGRect)rect;
- (void)setThumb:(NSString*)thumb;

@end

.m

#import "SearchTableViewCell.h"
#import "EGOImageView.h"

#import "UIView+Additions.h"

@implementation SearchTableViewCell

@synthesize nameLabel = _nameLabel, addressLabel = _addressLabel;

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    if ((self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])) {

        // Initialization code
        UIView *myContentView = self.contentView;

        // Name
        _nameLabel = [self labelWithColor:[UIColor blackColor] selectedColor:[UIColor whiteColor] fontSize:16.0f  bold:YES frame:CGRectMake(140.0f, 16.0f, 181.0f, 21.0f)];
        [myContentView addSubview:_nameLabel];
        [_nameLabel release];


        // Adress
        _addressLabel = [self labelWithColor:[UIColor blackColor] selectedColor:[UIColor whiteColor] fontSize:13.0f  bold:YES frame:CGRectMake(140.0f, _nameLabel.bottom, 181.0f, 21.0f)];
        [myContentView addSubview:_addressLabel];
        [_addressLabel release];


        // Image
        imageView = [[EGOImageView alloc] initWithPlaceholderImage:[UIImage imageNamed:@"placeholder.png"]];
        imageView.frame = CGRectMake(9.0f, 9.0f, 120.0f, 80.0f);
        [myContentView addSubview:imageView];
        [imageView release];

    }
    return self;
}

- (UILabel *)labelWithColor:(UIColor*)color selectedColor:(UIColor*)selectedColor fontSize:(CGFloat)fontSize bold:(BOOL)bold frame:(CGRect)rect {

    UIFont *font;
    if(bold) {
        font = [UIFont boldSystemFontOfSize:fontSize];
    } else {
        font = [UIFont systemFontOfSize:fontSize];
    }

    UILabel *label = [[UILabel alloc] initWithFrame:rect];
    label.backgroundColor = [UIColor clearColor];
    label.textColor = color;
    label.highlightedTextColor = selectedColor;
    label.font = font;

    return label;
}


- (void)setThumb:(NSString*)thumb {
    imageView.imageURL = [NSURL URLWithString:thumb];
}

- (void)willMoveToSuperview:(UIView *)newSuperview {
    [super willMoveToSuperview:newSuperview];

    if(!newSuperview) {
        [imageView cancelImageLoad];
    }
}

- (void)dealloc {
    [_addressLabel release];
    [_nameLabel release];
    [imageView release];
    [super dealloc];
}

@end

有人知道为什么我的应用在释放这样的单元格时会崩溃吗？注释掉dealloc方法上的2个标签和图像视图，应用程序不会崩溃，但是会有内存泄漏吗？

感谢所有提示！如果有不清楚的地方请留言！

Answer 1

imageView 被释放两次，一次是在创建时：

imageView = [[EGOImageView alloc] initWithPlaceholderImage:[UIImage imageNamed:@"placeholder.png"]];
imageView.frame = CGRectMake(9.0f, 9.0f, 120.0f, 80.0f);
[myContentView addSubview:imageView];
[imageView release];

并且一旦在 dealloc 中：

- (void)dealloc {
    [_addressLabel release];
    [_nameLabel release];
    [imageView release];
    [super dealloc];
}

Answer 2

You already release the memory for that labels after adding to view,again you are trying to release  memory those objects are already relese  in dealloc method that's why it is killing.if you remove 3 statements in dealloc method  it will not crash.   

Answer 3

我认为问题在于您直接在 initWithStyle 函数中释放属性，并再次在 dealloc 中释放属性。尝试从 initWithStyle 中删除版本：

此外，您在接口中命名变量时不带 _，但在实现中使用 _ @synthesize'ing