ios – 透明UITableViewHeaderFooterView

我想为这个UITableView制作一个自定义标题视图,我希望它是透明的.

我的代码…

接口…

typedef void(^ActionBlock)();

@interface MyViewHeaderView : UITableViewHeaderFooterView

@property (nonatomic,strong) UIImageView *flagImageView;
@property (nonatomic,strong) UILabel *leagueNameLabel;

@property (nonatomic,copy) ActionBlock tapAction;

@end

实现…

#import "MyViewHeaderView.h"

@interface MyViewHeaderView ()

@end

@implementation MyViewHeaderView

- (id)initWithReuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithReuseIdentifier:reuseIdentifier];
    if (self) {
        // Add customisation here...

        // I have tried everything here...
        self.tintColor = [UIColor colorWithWhite:0.961 alpha:1.0];
        self.alpha = 0.5;

        // self.contentView.backgroundColor = [UIColor colorWithWhite:0.5 alpha:0.5];
        // self.backgroundColor = [UIColor colorWithWhite:0.5 alpha:0.5];
        // can't remember what else.
        // none of it makes it transparent. It sets the colour against
        // a white background. i.e. 50% transparent but with a white opaque background.
        // so I can't see the content of the table scrolling behind it.

        self.flagImageView = [[UIImageView alloc] init];
        self.flagImageView.image = [UIImage imageNamed:@"placeholder_flag"];
        [self.flagImageView setTranslatesAutoresizingMaskIntoConstraints:NO];
        [self.contentView addSubview:self.flagImageView];

        self.leagueNameLabel = [[UILabel alloc] init];
        [self.leagueNameLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
        [self.contentView addSubview:self.leagueNameLabel];

        UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped)];
        tapGestureRecognizer.numberOfTapsrequired = 1;
        tapGestureRecognizer.numberOfTouchesrequired = 1;
        [self.contentView addGestureRecognizer:tapGestureRecognizer];

        [self setupConstraints];
    }
    return self;
}

- (void)setupConstraints
{
    // adding constraints...
}

- (void)viewTapped
{
    self.tapAction();
}

@end

在我的UITableViewDelegate我正在加载头像…

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    MyViewHeaderView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"HeaderView"];

    League *league = self.leagues[(NSUInteger) section];

    headerView.leagueNameLabel.text = league.name;
    headerView.tapAction = ^(){
        [self leagueTapped:league];
    };

    return headerView;
}

这是正常工作,标题正确显示.只是没有透明度.

我想要一个标题视图,如标准视图,您可以在其中查看在其后面滚动的表视图内容.

请你让我知道如何做到这一点.

解决方法

请原谅我无法使用stackoverflow ….

这是我如何设法实现它,使用这两个这些UITableviewDelegate方法：

- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section {
  if ([view isMemberOfClass:[UITableViewHeaderFooterView class]]) {
    ((UITableViewHeaderFooterView *)view).backgroundView.backgroundColor = [UIColor clearColor];
  }
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
  UITableViewHeaderFooterView *FeedHeaderView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"HeaderIdentifier"];

  //Other customizations

  return FeedHeaderView;
}

希望有帮助,让我永远弄清楚.似乎backgroundView不是在init中创建的,所以颜色不能被覆盖在那里.

ios – 透明UITableViewHeaderFooterView

解决方法

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