Question

我的UITableView上面有一个UIView。当用户向下滚动时，我希望UIView保持在屏幕顶部并让单元格滚动到它上面。 Shazam应用程序的第一页做了我想要的。

 - (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    if (self.tableView.contentOffset.y > 0) {
        CGRect newframe = self.publicTopView.frame;
        newframe.origin.y = -self.tableView.contentOffset.y;
        self.publicTopView.frame = newframe;
}

}

这是我到目前为止所尝试过的，但它并没有做任何事情。感谢

Answer 1

我会将drag设置为您的视图，然后将您的单元格设置为清晰（或任何您喜欢的透明度）。这将允许单元格在视图上移动。

Answer 2

您需要具有透明背景的scrollView。然后添加一个不透明的子视图，稍微向下偏移。这是一个矫枉过正的例子。 TextureView只是让你可以看到背景没有移动。

#import "ViewController.h"
@interface TextureView : UIView
@end
@implementation TextureView

-(void)drawRect:(CGRect)rect{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, 0, 0);
    CGContextAddLineToPoint(context, rect.size.width, rect.size.height);
    CGContextMoveToPoint(context, 0, rect.size.height);
    CGContextAddLineToPoint(context, rect.size.width, 0);
    CGContextSetStrokeColorWithColor(context, [[UIColor whiteColor]CGColor]);
    CGContextSetLineWidth(context, 8);
    CGContextStrokePath(context);
}

@end

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    CGRect scrollViewFrame = self.view.frame;
    CGFloat sectionHeight = 300;
    int numberSections = 3;
    CGFloat clearSpaceAtTop = 300;

    CGRect sectionsViewFrame = CGRectMake(0, clearSpaceAtTop, scrollViewFrame.size.width, sectionHeight * numberSections);
    CGSize contentSize = CGSizeMake(scrollViewFrame.size.width, CGRectGetMaxY(sectionsViewFrame));



    TextureView *backGroundView = [[TextureView alloc]initWithFrame:scrollViewFrame];
    backGroundView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:backGroundView];

    UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:scrollViewFrame];
    scrollView.contentSize = contentSize;
    scrollView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:scrollView];

    UIView *sectionViewsParent = [[UIView alloc]initWithFrame:sectionsViewFrame];
    sectionViewsParent.backgroundColor = [UIColor lightGrayColor];
    [scrollView addSubview:sectionViewsParent];

    NSArray *colors = @[[UIColor redColor],[UIColor greenColor],[UIColor purpleColor]];
    CGFloat spacer = 4;
    CGRect colorViewFrame = CGRectMake(0, 0, sectionsViewFrame.size.width, sectionHeight - spacer);
    for (UIColor *color in colors){
        UIView *sectionView = [[UIView alloc]initWithFrame:colorViewFrame];
        sectionView.backgroundColor = color;
        [sectionViewsParent addSubview:sectionView];
        colorViewFrame.origin.y += sectionHeight;
    }

}

@end

Answer 3

如果调用UIView实例iconView，则称UITableView实例为tableView，如果您的视图控制器是UIViewController。

[self.view addSubview:iconView];
[self.view addSubview:tableView];
//and you need set tableView.background to transparent.

如果你的视图控制器是UITableViewController，请阅读这个问题：

UITableViewController Background Image

Answer 4

基本上你所要做的就是使用UIScrollView的contentInset属性

let topInset = topViewHeight.constant //based on your needs
sampleTableView.contentInset = UIEdgeInsets(top: topInset, left: 0, bottom: 0, right: 0)

请参阅我的github示例here

IOS - 让UITableViewCells滚动UIView（就像shazam应用程序一样）

4 个答案: