Question

请教如何实现UITextField值变化的实时监视

Answer 1

UITableViewCell的contentView中的UITextField的值获取有几种方法，本人简单总结一下。1.获取UITextField所以Cell的NSIndexPath,知道了NSIndexPath就知道了这个UITextField是干什么的了。可以在-(BOOL)textField:(UITextField*)textFieldshouldChangeCharactersInRange:(NSRange)rangereplacementString:(NSString*)string{//getcellUITableViewCell*cell=[UITableViewCell][[textFieldsuperview]superview];NSIndexPath*indexPath=[tableViewindexPathForCell:cell];}或-(void)textFieldDidEndEditing:(UITextField*)textField{//getcellUITableViewCell*cell=(UITableViewCell*)[[textFieldsuperview]superview];NSIndexPath*indexPath=[tableViewindexPathForCell:cell];}中得知道UITextField中text是哪一个数据结构的值，前一个是实时的，后一个是失去焦点时一次性的。2。第二种方法与上面第一个有点类似也是实时的，-(UITableViewCell*)tableView:(UITableView*)tableViewcellForRowAtIndexPath:(NSIndexPath*)indexPath{NSIntegerrow=[indexPathrow];staticNSString*CellIdentifier=@"CellIdentifier";UITableViewCell*cell=[tableViewdequeueReusableCellWithIdentifier:CellIdentifier];if(cell==nil){cell=[[[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:CellIdentifier]autorelease];cell.selectionStyle=UITableViewCellSelectionStyleNone;}cell.textLabel.text=[_passwordArrayobjectAtIndex:row];CGRecttextFieldRect=CGRectMake(0.0,0.0f,215.0f,31.0f);UITextField*theTextField=[[UITextFieldalloc]initWithFrame:textFieldRect];theTextField.contentVerticalAlignment=UIControlContentVerticalAlignmentCenter;theTextField.returnKeyType=UIReturnKeyDone;theTextField.secureTextEntry=YES;theTextField.clearButtonMode=YES;theTextField.tag=row;theTextField.delegate=self;//此方法为关键方法[theTextFieldaddTarget:selfaction:@selector(textFieldWithText:)forControlEvents:UIControlEventEditingChanged];switch(row){case0:theTextField.placeholder=@"请输入旧密码";break;case1:theTextField.placeholder=@"请输入新密码";break;case2:theTextField.placeholder=@"请再次输入新密码";break;default:break;}cell.accessoryView=theTextField;[theTextFieldrelease];returncell;}-(void)textFieldWithText:(UITextField*)textField{switch(textField.tag){case0:self.theOldPassword=textField.text;break;case1:self.theNewPassword=textField.text;break;case2:self.theTwiceNewPassword=textField.text;break;default:break;}}