当我滚动 TableView 时,我的应用程序崩溃了。首先,在我的 viewDidLoad 方法中,我从文件中加载了一个字典,对于这个字典,我枚举了所有键。
- (void)viewDidLoad {
[super viewDidLoad];
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
path = [rootPath stringByAppendingPathComponent:[NSString stringWithFormat:@"currency.archive"]];
banks = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
keys = [banks allKeys];
// set date for last update
dayMonthYear.text = [banks objectForKey:@"Last Updated"];
}
在我的 cellForRowAtIndexPath 中,我用该字典中的数据填充单元格。无论如何,当我的应用程序启动时,一切看起来都很好,前五行绘制正确,但是当我开始滚动时,我的应用程序崩溃了。我的想法是这里的自动释放对象有问题,我试图保留它们并在使用它们后释放,但没有成功。调试器显示我的问题与粗体一致
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *CellIdentifier = [NSString stringWithFormat:@"Cell %d_%d",indexPath.section,indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
[[NSBundle mainBundle] loadNibNamed:@"CurrencyTableCell" owner:self options:nil];
cell = currencyTableCell;
//don't show selected cell
cell.selectionStyle = UITableViewCellSelectionStyleNone;
//set height
self.cellHeight = cell.frame.size.height;
}
// Fetch currency
NSString *currentCurrency = [keys objectAtIndex:indexPath.row];
NSDictionary *fetchedCurrency = [banks objectForKey:currentCurrency];
**NSString *name = [fetchedCurrency objectForKey:@"Currency Name"];**
currencyTitle.text = name;
NSString *charCode = [fetchedCurrency objectForKey:@"Code"];
currencyCode.text = charCode;
NSString* formattedNumber = [NSString stringWithFormat:@"%.02f",[[fetchedCurrency objectForKey:@"Value"] floatValue]];
if ([formattedNumber length] == 4) {
formattedNumber = [NSString stringWithFormat:@"%@%@",@"0",formattedNumber];
}
buyPrice.text = formattedNumber;
return cell;
}
最佳答案
作为讨论的结果,[banks objectForKey:@"Last Updated"]
给你一个 NSString,而不是 NSDictionary!
您可以通过执行以下操作来解决此错误
if ([[banks objectForKey:currentCurrency] class] == [NSDictionary class]) {
... rest of the code here ..
}
关于iphone - 滚动 TableView 时应用程序崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7662551/