不幸的是,我知道問題是什麼,但我是綠色的,不知道處理它的最佳方式。我已經閱讀了蘋果文檔和所有相關問題,無法充分發現或解釋信息。當滾動單元格時,如何維護和保存自定義單元格文本框輸入數據deque
正如您將在下面看到的。我有19個單元格的tableview。 2在第0節,17在第1節。一切工作正常,除了當我滾動時,我知道這是因爲tableview重用單元格,所以當我試圖保存下面我的代碼中看到這些單元格根本不存在因此,當我嘗試保存時,任何不在我看來的東西都是零字符串參數,因此我的實體最終以NaN結尾。
什麼是適當的方法來維護和保存我的所有細胞的文本框信息?預先感謝任何幫助!
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *newCell;
if (indexPath.section == 0 && indexPath.row == 0) {
NSString *cellIdentifier = @"RNDateCell";
RNCommentCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"RNCommentCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.commentLabel.text = NSLocalizedString(@"Date:", @"Date:");
cell.commentField.text = [NSString stringWithFormat:@"%@", self.metrics.timeStamp.description];
newCell = cell;
}
}
if (indexPath.section == 0 && indexPath.row == 1) {
NSString *cellIdentifier = @"RNCommentCell";
RNCommentCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"RNCommentCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.commentLabel.text = NSLocalizedString(@"Comment:", @"Comment:");
cell.commentField.text = self.metrics.comment;
newCell = cell;
}
}
if (indexPath.section == 1) {
static NSString *numericCellIdentifier = @"RNNumericCell";
RNNumericCell *cell = (RNNumericCell *)[tableView dequeueReusableCellWithIdentifier:numericCellIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle]loadNibNamed:@"RNNumericCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
switch (indexPath.row) {
case 0:
cell.numericCellLabel.text = NSLocalizedString(@"Weight:", @"Weight:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.weight];
newCell = cell;
break;
case 1:
cell.numericCellLabel.text = NSLocalizedString(@"Height:", @"Height:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.height];
newCell = cell;
break;
case 2:
cell.numericCellLabel.text = NSLocalizedString(@"Neck:", @"Neck:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.neck];
newCell = cell;
break;
case 3:
cell.numericCellLabel.text = NSLocalizedString(@"Chest:", @"Chest:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.chest];
newCell = cell;
break;
case 4:
cell.numericCellLabel.text = NSLocalizedString(@"Waist:", @"Waist:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.waist];
newCell = cell;
break;
case 5:
cell.numericCellLabel.text = NSLocalizedString(@"Hips:", @"Hips:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.hips];
newCell = cell;
break;
case 6:
cell.numericCellLabel.text = NSLocalizedString(@"Biceps:", @"Biceps:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.biceps];
newCell = cell;
break;
case 7:
cell.numericCellLabel.text = NSLocalizedString(@"Forearms:", @"Forearms:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.forearms];
newCell = cell;
break;
case 8:
cell.numericCellLabel.text = NSLocalizedString(@"Wrists:", @"Wrists:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.wrists];
newCell = cell;
break;
case 9:
cell.numericCellLabel.text = NSLocalizedString(@"Quads Thighs:", @"Quads Thighs:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.quadsThighs];
newCell = cell;
break;
case 10:
cell.numericCellLabel.text = NSLocalizedString(@"Calves:", @"Calves:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.calves];
newCell = cell;
break;
case 11:
cell.numericCellLabel.text = NSLocalizedString(@"Ankles:", @"Ankles:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.ankles];
newCell = cell;
break;
case 12:
cell.numericCellLabel.text = NSLocalizedString(@"Feet:", @"Feet:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.feet];
newCell = cell;
break;
case 13:
cell.numericCellLabel.text = NSLocalizedString(@"BMI:", @"BMI:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.bmi];
newCell = cell;
break;
case 14:
cell.numericCellLabel.text = NSLocalizedString(@"BMR:", @"BMR:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.bmr];
newCell = cell;
break;
case 15:
cell.numericCellLabel.text = NSLocalizedString(@"Waist/Height R:", @"Waist/Height R:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.waistToHeightRatio];
newCell = cell;
break;
case 16:
cell.numericCellLabel.text = NSLocalizedString(@"Waist/Hips R:", @"Waist/Hips R:");
cell.numericField.text = [NSString stringWithFormat:@"%@", self.metrics.waistToHipRatio];
newCell = cell;
break;
default:
break;
}
}
}
return newCell;
}
- (void)saveData
{
NSDateFormatter *dateFormat;
RNCommentCell *dateCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
self.metrics.timeStamp = [dateFormat dateFromString:dateCell.commentField.text];
RNCommentCell *commentCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]];
self.metrics.comment = commentCell.commentField.text;
RNNumericCell *weightCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]];
self.metrics.weight = [NSDecimalNumber decimalNumberWithString:weightCell.numericField.text];
RNNumericCell *heightCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:1]];
self.metrics.height = [NSDecimalNumber decimalNumberWithString:heightCell.numericField.text];
RNNumericCell *neckCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:2 inSection:1]];
self.metrics.neck = [NSDecimalNumber decimalNumberWithString:neckCell.numericField.text];
RNNumericCell *chestCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:3 inSection:1]];
self.metrics.chest = [NSDecimalNumber decimalNumberWithString:chestCell.numericField.text];
RNNumericCell *waistCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:4 inSection:1]];
self.metrics.waist = [NSDecimalNumber decimalNumberWithString:waistCell.numericField.text];
RNNumericCell *hipsCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:5 inSection:1]];
self.metrics.hips = [NSDecimalNumber decimalNumberWithString:hipsCell.numericField.text];
RNNumericCell *bicepsCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:6 inSection:1]];
self.metrics.biceps = [NSDecimalNumber decimalNumberWithString:bicepsCell.numericField.text];
RNNumericCell *forearmCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:7 inSection:1]];
self.metrics.forearms = [NSDecimalNumber decimalNumberWithString:forearmCell.numericField.text];
RNNumericCell *wristsCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:8 inSection:1]];
self.metrics.wrists = [NSDecimalNumber decimalNumberWithString:wristsCell.numericField.text];
RNNumericCell *quadsCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:9 inSection:1]];
self.metrics.quadsThighs = [NSDecimalNumber decimalNumberWithString:quadsCell.numericField.text];
RNNumericCell *calvesCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:10 inSection:1]];
self.metrics.calves = [NSDecimalNumber decimalNumberWithString:calvesCell.numericField.text];
RNNumericCell *anklesCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:11 inSection:1]];
self.metrics.ankles = [NSDecimalNumber decimalNumberWithString:anklesCell.numericField.text];
RNNumericCell *feetCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:12 inSection:1]];
self.metrics.feet = [NSDecimalNumber decimalNumberWithString:feetCell.numericField.text];
RNNumericCell *bmiCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:13 inSection:1]];
self.metrics.bmi = [NSDecimalNumber decimalNumberWithString:bmiCell.numericField.text];
RNNumericCell *bmrCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:14 inSection:1]];
self.metrics.bmr = [NSDecimalNumber decimalNumberWithString:bmrCell.numericField.text];
RNNumericCell *waistToHeightCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:15 inSection:1]];
self.metrics.waistToHeightRatio = [NSDecimalNumber decimalNumberWithString:waistToHeightCell.numericField.text];
RNNumericCell *waistToHipCell = (id)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:16 inSection:1]];
self.metrics.waistToHipRatio = [NSDecimalNumber decimalNumberWithString:waistToHipCell.numericField.text];
NSError *error;
if (![self.managedObjectContext save:&error]) {
NSLog(@"Error saving context: %@", error);
}
}
非常感謝你讓我看到了實現它的正確方法。我不夠聰明,不知道如何使用您提供的索引代碼。然而,只需將cell.texfield.tag = XXXX添加到我的單元格中的每一行索引路徑中,然後引用texfielddidendediting中的單元格以將數據保存到我的模型中,這對我來說很容易遵循並且工作得很好,希望這是一個經過批准和有效的方法。歡呼並再次感謝! – Narsil
不客氣!您可以像在cellForRowAtIndexPath中一樣使用indexPath。無論哪種方式,儘管它是一個完全有效的方式!由於您是該網站的新手,請確保投票通過點擊旁邊的向上箭頭幫助您的所有答案(無論您是否提問)。:) – lnafziger
非常感謝,現在我有信譽,我會這樣做! – Narsil