按钮在UITableViewCell中不可见时外屏

问题描述：

刷卡我做了一个自定义的UITableViewCell工作正常，除了当我滑动屏幕外的单元中的按钮变为不可见的事实：按钮在UITableViewCell中不可见时外屏

button invisble after swiping outside top of screen 。

当我切换到其他视图并更改回，按钮再次可见：

button visible 。

该按钮仍然存在，可以点击调用该过程，但文本似乎成为零。任何想法为什么？

的代码：

SettingsViewController.h

#import <UIKit/UIKit.h> 

@interface SettingsViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> 
@property (strong, nonatomic) IBOutlet UITableView *settingsTable; 
@end

SettingsViewController.m

#import "SettingsViewController.h" 
#import "MyCellClass.h" 
@interface SettingsViewController() 
@end 

@implementation SettingsViewController 
{ 
    NSMutableArray *_tableSectionNames; 
    NSMutableArray *_cellGroups; 
    NSMutableArray *_cellGroup; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    _cellGroups = [[NSMutableArray alloc] init]; 
    _cellGroup = [[NSMutableArray alloc] init]; 
    _tableSectionNames = [[NSMutableArray alloc] initWithObjects:@"Login", nil]; 

    MyCellClass *myCell = [[self settingsTable] dequeueReusableCellWithIdentifier:@"myCell"]; 
    [myCell.textLabel setText:[NSString stringWithFormat:@"Logged in as 1"]]; 
    [myCell.button setTitle:@"Logout" forState:UIControlStateNormal]; 
    [myCell.button addTarget:self action:@selector(userLogout) forControlEvents:UIControlEventTouchUpInside]; 

    [_cellGroup addObject:myCell]; 
    [_cellGroups addObject:_cellGroup]; 

    [[self settingsTable] reloadData]; 
} 

#pragma mark - Settings table view 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    return [_cellGroups[section] count]; 
} 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    return [_cellGroups count]; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    return [_cellGroups[indexPath.section] objectAtIndex:indexPath.row]; 
} 

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 
{ 
    if (_tableSectionNames[section]) 
    { 
     return _tableSectionNames[section]; 
    } else 
    { 
     return @""; 
    } 
}

MyCellClass.h

#import <UIKit/UIKit.h> 

@interface MyCellClass : UITableViewCell 
@property (weak, nonatomic) IBOutlet UIButton *button; 
@property (weak, nonatomic) IBOutlet UILabel *textLabel; 
@end

MyCellClass.m

#import "MyCellClass.h" 

@implementation MyCellClass 

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier 
{ 
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]; 
    if (self) { 
     // Initialization code 
    } 
    return self; 
} 

- (void)setSelected:(BOOL)selected animated:(BOOL)animated 
{ 
    [super setSelected:selected animated:animated]; 

    // Configure the view for the selected state 
} 

@end

这是当我看到我的自定义单元格与按钮：

<MyCellClass: 0xa7cf1b0; baseClass = UITableViewCell; frame = (0 55; 320 44); text = 'Logged in as 1'; autoresize = W; layer = <CALayer: 0xa7cf380>> 
    | <UITableViewCellScrollView: 0xa7bc3c0; frame = (0 0; 320 44); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0xa7bc650>; layer = <CALayer: 0xa7bc590>; contentOffset: {0, 0}> 
    | | <UITableViewCellContentView: 0xa7cf470; frame = (0 0; 320 44); opaque = NO; gestureRecognizers = <NSArray: 0xa7be530>; layer = <CALayer: 0xa7bbdf0>> 
    | | | <UIButton: 0xa7bbe20; frame = (217 5; 83 33); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0xa7bbf10>> 
    | | | <UILabel: 0xa7bbf40; frame = (15 17; 199 21); text = 'Logged in as 1'; clipsToBounds = YES; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xa772f80>>

这是当我看到标准的UITableViewCell无按钮后刷卡：

<MyCellClass: 0xa7cf1b0; baseClass = UITableViewCell; frame = (0 55; 320 44); text = 'Logged in as 1'; autoresize = W; layer = <CALayer: 0xa7cf380>> 
    | <UITableViewCellScrollView: 0xa7bc3c0; frame = (0 0; 320 44); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0xa7bc650>; layer = <CALayer: 0xa7bc590>; contentOffset: {0, 0}> 
    | | <UITableViewCellContentView: 0xa7cf470; frame = (0 0; 320 43.5); opaque = NO; gestureRecognizers = <NSArray: 0xa7be530>; layer = <CALayer: 0xa7bbdf0>> 
    | | | <UIButton: 0xa7bbe20; frame = (217 5; 83 33); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0xa7bbf10>> 
    | | | | <UIButtonLabel: 0xa897150; frame = (29 6; 54 21); text = 'Logout'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xa896860>> 
    | | | <UILabel: 0xa7bbf40; frame = (15 17; 199 21); text = 'Logged in as 1'; clipsToBounds = YES; autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xa772f80>> 
    | | <_UITableViewCellSeparatorView: 0xa88e8b0; frame = (0 43.5; 320 0.5); layer = <CALayer: 0xa8717d0>> 
    | | <_UITableViewCellSeparatorView: 0xa8780b0; frame = (0 0; 320 0.5); layer = <CALayer: 0xa882550>>

显示代码为你的表委托/数据源的方法 – Wain

感谢北斗星，添加的代码。 – Manuel

那么在MyCellClass中，由于表代码并没有做任何事情。（另外，你什么时候创建'_cell *'数组 - 我只是没有显示？） – Wain

答

原因w作为设置我的自定义单元格的@properties为“弱”，而不是“强”：

@interface MyCustomCell : UITableViewCell 
@property (weak, nonatomic) IBOutlet UIButton *buttonRight; 
@property (weak, nonatomic) IBOutlet UILabel *textLabel; 
@end

所以我改成了“强”：

@interface MyCustomCell : UITableViewCell 
@property (strong, nonatomic) IBOutlet UIButton *buttonRight; 
@property (strong, nonatomic) IBOutlet UILabel *textLabel; 
@end

然后，我看到两个文本重叠彼此。原因是我将文本标签命名为textLabel，它与UITableViewCell中的文本标签名称相同。所以我基本上用相同的文本填充了两个文本标签，我注意到只有按钮消失，但实际上它是整个定制单元类消失。

所以我也改变了属性的名称，它工作得很好：

@interface MyCustomCell : UITableViewCell 
@property (strong, nonatomic) IBOutlet UIButton *buttonRight; 
@property (strong, nonatomic) IBOutlet UILabel *labelLeft; 
@end

按钮在UITableViewCell中不可见时外屏

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