ios7 creating custom tableview cell accessories

static NSString *MyCellIdentifier = @"SimpleCell";

@interface  () <UITableViewDelegate, UITableViewDataSource>
@property (nonatomic, strong) UITableView *myTableView;
@end

@implementation 


-(UIStatusBarStyle)preferredStatusBarStyle
{
    return UIStatusBarStyleLightContent;
}

-(void)viewWillLayoutSubviews{
    //iOS7，UIScreen下降20像素，显示黑色电池栏
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
        self.view.clipsToBounds = YES;
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        CGFloat screenHeight = screenRect.size.height;
        self.view.frame =  CGRectMake(0, 20, self.view.frame.size.width,screenHeight-20);
        self.view.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    }
}

//__unused
- (UIView *) superviewOfType:(Class)paramSuperviewClass
                     forView:(UIView *)paramView{
    if (paramView.superview != nil){
        if ([paramView.superview isKindOfClass:paramSuperviewClass]){
            return paramView.superview;
        } else {
            return [self superviewOfType:paramSuperviewClass
                                 forView:paramView.superview];
        }
    }
    return nil;
}

//处理按钮点击事件
- (void) performExpand:(UIButton *)paramSender{
    //__unused 未使用
    __unused UITableViewCell *parentCell = (UITableViewCell *)[self superviewOfType:[UITableViewCell class] forView:paramSender];
    
}
    
- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell* cell = nil;
    
    cell = [tableView dequeueReusableCellWithIdentifier:MyCellIdentifier
                                           forIndexPath:indexPath];
    
    cell.textLabel.text = [NSString stringWithFormat:@"Section %ld, Cell %ld",
                             (long)indexPath.section,
                             (long)indexPath.row];
    //初始化button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    //设置坐标
    button.frame = CGRectMake(0.0f, 0.0f, 150.0f, 25.0f);
    //设置title，规则
    [button setTitle:@"Expand"
            forState:UIControlStateNormal];
    
    //添加点击事件
    [button addTarget:self
               action:@selector(performExpand:)
     forControlEvents:UIControlEventTouchUpInside];
    
    cell.accessoryView = button;
    
    return cell;
    
}

//3 section
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{
    return 3;
}

//3rows
- (NSInteger) tableView:(UITableView *)tableView
  numberOfRowsInSection:(NSInteger)section{
    return 3;
}
    
- (void)viewDidLoad{
    [super viewDidLoad];
     //使用布局，显示扩展边缘
//    self.edgesForExtendedLayout = UIRectEdgeNone;
    
    //初始化tableview，style为plain类型
    self.myTableView = [[UITableView alloc]
                        initWithFrame:self.view.bounds
                        style:UITableViewStylePlain];
    
    //注册cell类
    [self.myTableView registerClass:[UITableViewCell class]
             forCellReuseIdentifier:MyCellIdentifier];
    
    //datasource，delegate指向ViewController
    self.myTableView.dataSource = self;
    self.myTableView.delegate = self;
    
    //自动调整布局
    self.myTableView.autoresizingMask =
        UIViewAutoresizingFlexibleWidth |
        UIViewAutoresizingFlexibleHeight;
    
    //添加到view
    [self.view addSubview:self.myTableView];
    
}

@end