我有和5个字符串元素的NSArray，填充我的iPhone应用程序的UITableView。
一切正常，但有时我的数组的第一个字符串丢失，我无法弄清楚原因。
这是我的代码：
arrayList = [[NSArray alloc] initWithObjects: @"My First String",
@"My Second String",
@"My Third String",
@"My Forth String",
@"My Fifth Sring",
nil];
有时不会显示的元素是我的第一个字符串
实际上我正在使用Cocoa With Love的示例代码。谢谢你帮助我！
- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
#if USE_CUSTOM_DRAWING
const NSInteger TOP_LABEL_TAG = 1001;
// const NSInteger BOTTOM_LABEL_TAG = 1002;
UILabel *topLabel;
// UILabel *bottomLabel;
#endif
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
//
// Create the cell.
//
cell =
[[[UITableViewCell alloc]
initWithFrame:CGRectZero
reuseIdentifier:CellIdentifier]
autorelease];
#if USE_CUSTOM_DRAWING
UIImage *indicatorImage = [UIImage imageNamed:@"image1.png"];
cell.accessoryView =
[[[UIImageView alloc]
initWithImage:indicatorImage]
autorelease];
const CGFloat LABEL_HEIGHT = 22;
UIImage *image = [UIImage imageNamed:@"image2.png"];
//
// Create the label for the top row of text
//
topLabel =
[[[UILabel alloc]
initWithFrame:
CGRectMake(
image.size.width + 2.0 * cell.indentationWidth,
0.5 * (aTableView.rowHeight - 1.3 * LABEL_HEIGHT),
aTableView.bounds.size.width -
image.size.width - 4.0 * cell.indentationWidth
- indicatorImage.size.width,
LABEL_HEIGHT)]
autorelease];
[cell.contentView addSubview:topLabel];
//
// Configure the properties for the text that are the same on every row
//
topLabel.tag = TOP_LABEL_TAG;
topLabel.backgroundColor = [UIColor clearColor];
topLabel.textColor = [UIColor colorWithRed:0.25 green:0.0 blue:0.0 alpha:1.0];
topLabel.highlightedTextColor = [UIColor colorWithRed:1.0 green:1.0 blue:0.9 alpha:1.0];
topLabel.font = [UIFont systemFontOfSize:[UIFont labelFontSize]];
topLabel.textAlignment = UITextAlignmentCenter;
/*
//
// Create the label for the bottom row of text
//
bottomLabel =
[[[UILabel alloc]
initWithFrame:
CGRectMake(
image.size.width + 2.0 * cell.indentationWidth,
0.5 * (aTableView.rowHeight - 2 * LABEL_HEIGHT) + LABEL_HEIGHT,
aTableView.bounds.size.width -
image.size.width - 4.0 * cell.indentationWidth
- indicatorImage.size.width,
LABEL_HEIGHT)]
autorelease];
[cell.contentView addSubview:bottomLabel];
//
// Configure the properties for the text that are the same on every row
//
bottomLabel.tag = BOTTOM_LABEL_TAG;
bottomLabel.backgroundColor = [UIColor clearColor];
bottomLabel.textColor = [UIColor colorWithRed:0.25 green:0.0 blue:0.0 alpha:1.0];
bottomLabel.highlightedTextColor = [UIColor colorWithRed:1.0 green:1.0 blue:0.9 alpha:1.0];
bottomLabel.font = [UIFont systemFontOfSize:[UIFont labelFontSize] - 2];
*/
//
// Create a background image view.
//
cell.backgroundView =
[[[UIImageView alloc] init] autorelease];
cell.selectedBackgroundView =
[[[UIImageView alloc] init] autorelease];
#endif
}
#if USE_CUSTOM_DRAWING
else
{
topLabel = (UILabel *)[cell viewWithTag:TOP_LABEL_TAG];
// bottomLabel = (UILabel *)[cell viewWithTag:BOTTOM_LABEL_TAG];
}
topLabel.text = [arrayList objectAtIndex:indexPath.row];
//bottomLabel.text = [NSString stringWithFormat:@"Some other information.", [indexPath row]];
// [cell LabelText:[arrayList objectAtIndex:indexPath.row]];
//
// Set the background and selected background images for the text.
// Since we will round the corners at the top and bottom of sections, we
// need to conditionally choose the images based on the row index and the
// number of rows in the section.
//
UIImage *rowBackground;
UIImage *selectionBackground;
NSInteger sectionRows = [aTableView numberOfRowsInSection:[indexPath section]];
NSInteger row = [indexPath row];
if (row == 0 && row == sectionRows - 1)
{
rowBackground = [UIImage imageNamed:@"topAndBottomRow.png"];
selectionBackground = [UIImage imageNamed:@"topAndBottomRowSelected_copy.png"];
}
else if (row == 0)
{
rowBackground = [UIImage imageNamed:@"topRow.png"];
selectionBackground = [UIImage imageNamed:@"topRowSelected_copy.png"];
}
else if (row == sectionRows - 1)
{
rowBackground = [UIImage imageNamed:@"bottomRow.png"];
selectionBackground = [UIImage imageNamed:@"bottomRowSelected_copy.png"];
}
else
{
rowBackground = [UIImage imageNamed:@"middleRow.png"];
selectionBackground = [UIImage imageNamed:@"middleRowSelected_copy.png"];
}
((UIImageView *)cell.backgroundView).image = rowBackground;
((UIImageView *)cell.selectedBackgroundView).image = selectionBackground;
if (row == 0)
{
cell.imageView.image = [UIImage imageNamed:@"pic1.png"];
}
else if (row == 1)
{
cell.imageView.image = [UIImage imageNamed:@"pic2.png"];
}
else if (row == 2)
{
cell.imageView.image = [UIImage imageNamed:@"pic3.png"];
}
else if (row == 3)
{
cell.imageView.image = [UIImage imageNamed:@"pic4.png"];
}
else if (row == 4)
{
cell.imageView.image= [UIImage imageNamed:@"pic5.png"];
}
#else
[cell LabelText:[arrayList objectAtIndex:indexPath.row]];
//cell.text = [NSString stringWithFormat:@"Cell at row %ld.", [indexPath row]];
#endif
return cell;
}
答案 0 :(得分：5)
您可能遇到的问题是将对象1作为索引1访问... Objective-C中的数组与大多数其他C结构语言相同。从0开始索引。
将此代码放入。
for (int i = 0; i < [arrayList count]; i++)
{
NSLog(@"Item %d = %@", i, [arrayList objectAtIndex:i]);
}
这很好，这很好。
如果不是这种情况，我建议将iphone恢复为出厂默认值，因为操作系统出现故障，或者您有其他恶意进程损坏内存。
调试上面的代码。当你抓住数组中的项目时，我会放入一个NSLog（）
NSString *objectAtIndex = [arrayList objectAtIndex:indexPath.row];
NSLog(@"Row: %d, Object: %@, Count: %d",indexPath.row, objectAtIndex, [arrayList count]);
[cell LabelText:[arrayList objectAtIndex:indexPath.row]];
答案 1 :(得分：0)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [arrayList objectAtIndex:indexPath.row];
return cell;
}
您是否正在为填充表格视图做类似的事情
答案 2 :(得分：-2)
NSMutableArray *ArrayList=[[NSMutableArray alloc]initWithObjects: @"My First String",
@"My Second String",
@"My Third String",
@"My Forth String",
@"My Fifth Sring",
nil];