objective-c - 将图像和滚动图标添加到 TableView 的逻辑

Question

我有一个表格 View ，我在一行中添加了四个 UIImageView，所以我总共有五行和二十个 ImageView 。我正在将图像一张一张地插入到单元格中。只有当所有四个 ImageView 都被填充后，第二行才会开始填充。

为此我需要一些逻辑。我的意思是，我如何检查表格 View 中接下来要填充的位置以及在哪个事件中？如何将图像一张一张地添加到 UIImageView 中？此外，最初只会显示两行。填充这两行后，当图像开始进入第三行时，我需要在屏幕上的最后一行旁边显示一个图标，告诉用户下面还有更多数据。另外，是否有任何事件可以检测当前哪一行是屏幕上的最后一行？

还有什么方法可以从一行中单独选择图像吗？

Answer 1

运行这段代码:-

.h file code


#import <UIKit/UIKit.h>

@interface helpTableViewController : UIViewController {
    IBOutlet UITableView *gridTableView;
    NSMutableArray *imagesArray;
    int widthview,widthview1;

    }
@property(nonatomic,retain)NSMutableArray *imagesArray;
@property(nonatomic,retain)UITableView *gridTableView;
-(UITableViewCell *)reuseTableViewCellWithIdentifier:(NSString *)identifier withIndexPath:(NSIndexPath *)indexPath;
-(void)crossViewButtonClicked:(UIButton *)sender;

@end

.m文件代码:-

@synthesize gridTableView;
@synthesize imagesArray;


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
    NSMutableArray *tempArray=[[NSMutableArray alloc]init];
    self.imagesArray=tempArray;
    [tempArray release];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic1.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic2.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic3.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic4.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic5.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic6.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic1.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic2.png"]];
    [self.imagesArray addObject:[UIImage imageNamed:@"pic3.png"]];
    widthview=0;
    widthview1=0;
}

- (void)viewDidUnload {
    self.gridTableView=nil;
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [imagesArray release];
    [gridTableView release];
    [super dealloc];
}


#pragma mark -
#pragma mark TableView Methods

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}


// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 2;

}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    cell=nil;
    if (cell == nil) {
        cell =[self reuseTableViewCellWithIdentifier:CellIdentifier withIndexPath:indexPath];

    }

            return cell;
}
-(UITableViewCell *)reuseTableViewCellWithIdentifier:(NSString *)identifier withIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:identifier]autorelease];
    if (indexPath.row==0) {
        UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 180)];
        scrollView.contentSize = CGSizeMake(320, 180);
        scrollView.backgroundColor=[UIColor clearColor];
        scrollView.showsHorizontalScrollIndicator = NO;
        [cell.contentView addSubview:scrollView];       
        for (int i=0; i<4;i++) {        
            UIView *profileView=[[UIView alloc]initWithFrame:CGRectMake(widthview+10, 12, 95, 155)];
            profileView.backgroundColor=[UIColor whiteColor];
            UIImageView *profileimageView=[[UIImageView alloc]initWithFrame:CGRectMake(5, 8, 83, 106)];
            [profileimageView setImage:[self.imagesArray objectAtIndex:i]];
            profileimageView.tag=i+90;
            [profileView addSubview:profileimageView];
            [profileimageView release];
            [scrollView addSubview:profileView];
            widthview=widthview+105;
            NSLog(@"%d",widthview);
        }
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [button setFrame:CGRectMake(widthview1+10, 12, 95, 155)];
        //button.contentMode = UIViewContentModeScaleAspectFill;
        button.tag=999999;
        [button setBackgroundColor:[UIColor greenColor]];
        [button addTarget:self action:@selector(imageButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [scrollView addSubview:button];
        widthview=widthview+105;
        scrollView.contentSize = CGSizeMake(widthview, 180);

    }
    if (indexPath.row==1) {
        UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 180)];
        scrollView.contentSize = CGSizeMake(320, 180);
        scrollView.backgroundColor=[UIColor clearColor];
        scrollView.showsHorizontalScrollIndicator = NO;
        [cell.contentView addSubview:scrollView];       
        for (int i=0; i<4;i++) {        
            UIView *profileView=[[UIView alloc]initWithFrame:CGRectMake(widthview1+10, 12, 95, 155)];
            profileView.backgroundColor=[UIColor whiteColor];

            UIImageView *profileimageView=[[UIImageView alloc]initWithFrame:CGRectMake(5, 8, 83, 106)];
            //  [profileimageView setImage:[UIImage imageNamed:@"gridimage1.png"]];
            profileimageView.tag=4+i;
            [profileimageView setImage:[self.imagesArray objectAtIndex:3+i]];
            [profileView addSubview:profileimageView];

            [scrollView addSubview:profileView];
            [profileimageView release];
            widthview1=widthview1+105;
            NSLog(@"%d",widthview1);
        }
        scrollView.contentSize = CGSizeMake(widthview1, 180);

    }return cell;

}

// Override to support row selection in the table view.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

}
#pragma mark -
#pragma mark button methods


-(void)imageButtonClicked:(UIButton *)sender
{
    [self.imagesArray replaceObjectAtIndex:0 withObject:[UIImage imageNamed:@"abdulprofilepic.png"]];
    [self.gridTableView reloadData];

}