Question

我正在编写iOS应用程序。我有CollectionView窗口，里面有一个通过拖放添加的customCell。当我运行应用程序时，CollectionView窗口的一部分是黑色的。集合可重用视图标识符设置为“ItemCell”。自定义视图单元格设置为“CustomViewCell”类。 CollectionView的dataSource和delegate已设置为FirstViewController。那就是代码：

FirstViewcontroller:
#import <UIKit/UIKit.h>
#import "CustomViewCell.h"

@interface FirstViewController : UIViewController<UICollectionViewDataSource, UICollectionViewDelegate>
@property (weak, nonatomic) IBOutlet UITextField *txtField;

- (IBAction)slideRed:(id)sender;

- (IBAction)slideGreen:(id)sender;
- (IBAction)slideBlue:(id)sender;
- (IBAction)btnAdd:(id)sender;

@end

.m文件：

#import "FirstViewController.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.


}
-(void)viewDidAppear:(BOOL)animated
{

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 10;
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 5;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

    CustomViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"ItemCell" forIndexPath:indexPath];

    if (cell == nil) {
        cell = [[CustomViewCell alloc]init];
    }


    cell.label.text = @"KitKat";
    //cell.lblMain.textColor = [UIColor whiteColor];
    // cell.backgroundColor = [UIColor blackColor];

    return cell;
}


- (IBAction)slideRed:(id)sender {
}

- (IBAction)slideGreen:(id)sender {
}

- (IBAction)slideBlue:(id)sender {
}

- (IBAction)btnAdd:(id)sender {
}
@end

CustomViewCell：

#import "CustomViewCell.h"

@implementation CustomViewCell
@synthesize label;
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}



@end

如何强制该collectionView窗口显示带有标签的customCell。然而它只是黑色的窗户。最好的问候

Answer 1

无法使默认透明度正常工作。但是解决方法解决了这个问题。 1.选择collectionView。 2.单击“背景”属性添加颜色。 3.选择颜色（在我的情况下为“白色”） 4.将颜色“不透明度”设置为“0％” 你有一个透明的背景。

Answer 2

我可能需要一个额外的步骤（我认为是类型转换），我发现这有助于将整个过程链接在一起。这是我要比较的代码：

- (CustomViewCell *)collectionView:(UICollectionView *)collectionView
              cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *cellIdentifier = @"collectCell";
    CustomViewCell *customCell = (CustomViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

    return customCell;
}

www评论是正确的，您需要在(id)initWithFrame:(CGRect)frame中初始化您的UI元素，然后使用相同的方法将其添加到self.contentView addSubview:viewElement。例如：

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
    if (self) {
        stringLabel = [[UILabel alloc] init];
        //set the properties of your element
        [self.contentView addSubview:stringLabel];
    }
return self;
}

您也可以尝试这样做：

[collectionView registerClass:[CustomViewCell class] forCellWithReuseIdentifier:@"collectCell"];

CollectionView窗口保持黑色

2 个答案: