Question

我做了重大更改并为TableView Cell设置了自定义类。

Cell.h

#import <UIKit/UIKit.h>

@interface Cell : UITableViewCell
@property (nonatomic, retain) UILabel *month;
@property (nonatomic, retain) UILabel *date;
@end

Cell.m

#import "Cell.h"

@implementation Cell
@synthesize date, month;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}
- (void)layoutSubviews {
    [super layoutSubviews];
    self.imageView.frame = CGRectMake(1,1,69,69);

    float limgW =  self.imageView.image.size.width;
    if(limgW > 0) {
        UIFont *cellFont3 = [UIFont fontWithName:@"ArialRoundedMTBold" size:9];
        UIFont *cellFont4 = [UIFont fontWithName:@"ArialRoundedMTBold" size:18];
        self.textLabel.frame = CGRectMake(82,0,228,53);
        self.detailTextLabel.frame = CGRectMake(82, 20, 228, 53);
        self.month = [[UILabel alloc] initWithFrame:CGRectMake(8, 10, 53, 21)];
        self.month.font = cellFont3;
        self.month.textAlignment = UITextAlignmentCenter;
        self.month.backgroundColor = [UIColor clearColor];

        self.date = [[UILabel alloc] initWithFrame:CGRectMake(11, 21, 50, 45)];
        self.date.backgroundColor = [UIColor clearColor];
        self.date.font = cellFont4;
        self.date.textAlignment = UITextAlignmentCenter;

    }
}
@end

然后在我的TableView代码中：

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

    static NSString *CellIdentifier = @"Cell";

    Cell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[Cell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];

    }


    RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row];

    NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
    [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
    [dateFormatter setDateStyle:NSDateFormatterShortStyle];

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"MM"];
    NSString *monthfromdate = [formatter stringFromDate:entry.articleDate];
    NSLog(@"%@", monthfromdate);
    [formatter release];

    NSDateFormatter *formatter2 = [[NSDateFormatter alloc] init];
    [formatter2 setDateFormat:@"dd"];
    NSString *datefromdate = [formatter2 stringFromDate:entry.articleDate];
    NSLog(@"%@", datefromdate);
    [formatter2 release];

    if ([monthfromdate isEqualToString:@"01"]) {
        self.currentmonth = @"January";
    }
    if ([monthfromdate isEqualToString:@"02"]) {
        self.currentmonth = @"February";
    }
    if ([monthfromdate isEqualToString:@"03"]) {
        self.currentmonth = @"March";
    }
    if ([monthfromdate isEqualToString:@"04"]) {
        self.currentmonth = @"April";
    }
    if ([monthfromdate isEqualToString:@"05"]) {
        self.currentmonth = @"May";
    }
    if ([monthfromdate isEqualToString:@"06"]) {
        self.currentmonth = @"June";
    }
    if ([monthfromdate isEqualToString:@"07"]) {
        self.currentmonth = @"July";
    }
    if ([monthfromdate isEqualToString:@"08"]) {
        self.currentmonth = @"August";
    }
    if ([monthfromdate isEqualToString:@"09"]) {
        self.currentmonth = @"September";
    }
    if ([monthfromdate isEqualToString:@"10"]) {
        self.currentmonth = @"October";
    }
    if ([monthfromdate isEqualToString:@"11"]) {
        self.currentmonth = @"November";
    }
    if ([monthfromdate isEqualToString:@"12"]) {
        self.currentmonth = @"December";
    }


    NSString *currentday = datefromdate;


    NSString *articleDateString = [dateFormatter stringFromDate:entry.articleDate];
    UIFont *cellFont = [UIFont fontWithName:@"ArialRoundedMTBold" size:15];
    UIFont *cellFont2 = [UIFont fontWithName:@"ArialRoundedMTBold" size:12];

    cell.imageView.image = [UIImage imageNamed:@"calendar1.png"];
    cell.imageView.contentMode = UIViewContentModeScaleAspectFit;



    cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ - %@", articleDateString, entry.blogTitle];
    cell.detailTextLabel.textColor = [UIColor grayColor];
    cell.detailTextLabel.font = cellFont2;

    cell.textLabel.text = entry.articleTitle;
    cell.textLabel.font = cellFont;
    cell.month.text = currentmonth;
    cell.date.text = currentday;
    return cell;
}

这解决了重复或标签相互叠加的问题，但只有cell.textLabel显示任何内容。 detailTextLabel或我设置的其他2个标签上没有任何内容。

Answer 1

您的方法不正确。当重用单元时，它并不一定意味着下一次该特定索引路径单元变得可见时，索引路径{0,1}上的单元将被重用。将使用具有相同标识符的单元，并且它可能包含不同索引路径处的不同单元的数据。您的方法应该是在出队后取决于单元存在而使单元出列或初始化，但始终根据索引路径在单元上分配数据。

一些建议：不要在cellForRowAtIndexPath方法中创建/释放NSDateFormatter对象。它会给你性能问题。此外，出于组织目的，请为UITableViewCell创建子类并正确创建接口。动态添加它们会让人感到麻烦和混乱。

另外，看看你想要做什么，你可能想看看NSDateFormatter的monthSymbols和weekdaySymbols方法，以及NSDateComponent documentation。您可以获得月份和日期信息，而不是获得12个“ifs”来获得月份。

Answer 2

将此问题转移到答案，因为我认为这可能是解决方案（希望如此）。

我认为您的标签显示不正确，因为您在布局子视图方法中有它们。当您执行调用setFrame，addSubview或调整视图大小等操作时，会自动调用此方法。您没有在您的cellForRowAtIndexPath中进行任何调用，因此操作系统不会自动进行布局子视图调用（我希望这是有道理的并且是正确的）。如果我是你，我会为表格单元格提供一个单独的XIB，它更易于管理。

不了解重用表视图单元格

2 个答案: