ios - 在 iOS 中，如何在两个单元格中的文本字段之间切换？
<p><p>我有一个使用自定义单元格的 TableView 的应用程序，每个单元格都包含一个文本字段。当用户点击一个单元格时，我想将相应的 textField 置于编辑模式。如果另一个单元格的 textField 已经处于编辑模式，我需要让它 resignFirstResponder 以便我可以保存它的数据，然后使新单元格的 textField 成为 FirstResponder。但是当我在新单元格的 textField 上调用 becomeFirstResponder 时，它返回一个零，表示失败。这似乎是一种困惑的处理方式，但我还没有找到更好的方法。</p>
<p>这是我的 TableViewController 文件的全文，其中去除了很多杂乱无章的内容:</p>
<pre><code>//TEST_TVC.h
//TVC_Test
#import <UIKit/UIKit.h>
@interface TEST_TVC : UITableViewController <UITextFieldDelegate>
@end
//TEST_TVC.m
//TVC_Test
#import "TEST_TVC.h"
@interface TEST_TVC ()
@property (strong, nonatomic) NSMutableArray * TestData;
@property (strong, nonatomic) UITextField * fieldBeingEdited;
@property (assign, nonatomic) NSInteger cellIndex;
@property (strong, nonatomic) UITableViewCell * cellContainingField;
@end
@implementation TEST_TVC
- (id)initWithStyle:(UITableViewStyle)style
{
self = ;
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
;
// Init data for testing the TableView
self.TestData = ;
for (int i=0; i<25; i++) {
NSString * title = ;
NSArray * data = ;
;
}
self.fieldBeingEdited = NULL;
self.cellContainingField = NULL;
self.cellIndex = -1;
}
- (void)didReceiveMemoryWarning
{
;
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.TestData.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Configure the cell...
NSString *CellIdentifier = @"TVCell";
NSString * titleText;
NSString * detailText;
NSString * detailPlaceholder = @"none";
// Get the data for this row
int rowNumber = indexPath.row;
NSArray * cellData = self.TestData;
titleText = cellData;
detailText = cellData;
//NSLog(@"cellForRow..., entered row=%d, titleText=%@, detailText=%@", rowNumber, titleText, detailText);
// Retrieve a pre-built cell to fill in the blanks
UITableViewCell *cell = ;
UILabel * cellTitle = (UILabel *);
cellTitle.text = titleText;
UITextField * cellDetail = (UITextField *);
NSLog(@"cellForRow.. reusing cell with Title=%@ and Detail=%@", cellTitle.text, cellDetail.text);
NSLog(@"cellForRow.. intended Title=%@, intended Detail=%@", titleText, detailText);
if (cellDetail == NULL) {
NSLog(@"cellForRow..; cellDetail = NULL *******************************************");
}
// Set default configuration of the cellData UITextField here, and make exceptions later
cellDetail.placeholder = @"";
cellDetail.text = @"";
cellDetail.borderStyle = UITextBorderStyleRoundedRect;
cellDetail.userInteractionEnabled = NO;
cell.accessoryType = UITableViewCellAccessoryNone;
cell.userInteractionEnabled = YES;
// Configure the cell...
// based on the data type of the cell's contents
// Set the cell's editable textField
if ( ) {
cellDetail.text = @"";
cellDetail.placeholder = detailPlaceholder;
} else {
cellDetail.text = detailText;
}
cellDetail.keyboardType = UIKeyboardTypeASCIICapable;
cellDetail.autocapitalizationType = UITextAutocapitalizationTypeWords;
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
int rowNumber = indexPath.row;
;
NSLog(@"didSelectRow.. entered; row=%d, cellData=%@", rowNumber, self.TestData);
// The selected cell contains a textField with content to be edited
// If another cell's textField is currently being edited, save its data before proceding
UITableViewCell * cell = ;
UITextField * cellDetail = (UITextField *);
NSLog(@"didSelectRow..: curently editing cell at [%p], selected cell at [%p]", self.fieldBeingEdited, cell);
// if a textField is still in edit mode, show the Responder status of the cell and all in it
if ( self.fieldBeingEdited != NULL ) {
;
}
if ( self.fieldBeingEdited == NULL ) {
NSLog(@"didSelectRow..: no field is being edited.");
} else if ( cellDetail == self.fieldBeingEdited ) {
// the cell selected is the same one being edited
if ( ! ) {
// fieldBeingEdited is NOT the firstResponder. Try to make it the firstResponder.
BOOL becameFirstResponder = ;
NSLog(@"didSelectRow..: textField at [%p] returned %d from becomeFirstResponder.", self.fieldBeingEdited, becameFirstResponder);
;
}
} else if ( cellDetail != self.fieldBeingEdited ) {
// the cell selected is NOT the one being edited. Save the edited data and release the keyboard
NSLog(@"didSelectRow..: field in cell with index=%d is being edited. Text=%@", self.cellIndex, self.fieldBeingEdited.text);
BOOL resignedFirstResponder;
;
// This method call will log the responder status of this cell and all it is contained within
//;
resignedFirstResponder = ;
NSLog(@"didSelect..: resignFirstResponder on [%p] returned %d", self.fieldBeingEdited, resignedFirstResponder);
//;
if (resignedFirstResponder) {
self.fieldBeingEdited = NULL;
self.cellContainingField = NULL;
self.cellIndex = -1;
}
}
// Enable the textField within the selected cell for in-place editing
cellDetail.userInteractionEnabled = YES;
cellDetail.enabled = YES;
BOOL becameFirstResponder = ;
NSLog(@"didSelectRow..: becomeFirstResponder returned %d", becameFirstResponder);
if ( becameFirstResponder ) {
// Update all the references and indexes for the cell and textField being edited.
self.fieldBeingEdited = cellDetail;
self.cellContainingField = cell;
self.cellIndex = rowNumber;
}
NSLog(@"didSelectRow.. exit; textFieldBeingEdited.text=%@, cellIndex=%d", self.fieldBeingEdited.text, self.cellIndex);
}
-(BOOL) textFieldShouldBeginEditing:(UITextField *)textField
{
NSLog(@"textFieldShouldBeginEditing entered");
NSLog(@"... returning YES");
return YES;
}
-(void) textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"textFieldDidEndEditing entered with text: %@, cellIndex=%d", textField.text, self.cellIndex);
NSInteger cellIndex = self.cellIndex;
NSMutableArray * cellData = ];
;
;
textField.enabled = NO;
;
if ( ) {
NSLog(@"EditFlight(466): textFieldDidEndEditing; textField IS STILL the firstresponder!");
}
NSLog(@"textFieldDidEndEditing exit; cellData=%@", cellData);
}
-(BOOL) textFieldShouldReturn: (UITextField *)textField
{
NSLog(@"textFieldShouldReturn; textField.text=%@", textField.text);
;
BOOL resignedFirstResponder = ;
NSLog(@"textFieldShouldReturn; resignFirstResponder returned %d",resignedFirstResponder);
return YES;
}
-(void) showCellResponderStatus:(UITableViewCell*)cell
{
NSLog(@"showCellResponderStatus entered");
if ( ) {
NSLog(@"cell at [%p] IS first responder", cell);
}else{
NSLog(@"cell at [%p] IS NOT first responder", cell);
}
NSArray * cellSubViews = [ subviews];
for ( UIView* uiv in cellSubViews ) {
if ( ) {
NSLog(@"subview at [%p] is a %@ and IS first responder", uiv, uiv.class);
} else {
NSLog(@"subview at [%p] is a %@ and IS NOT first responder", uiv, uiv.class);
}
}
}
-(void) showViewHierarchy:(UIView*) uiv
{
NSLog(@"View Hierarchy");
while (uiv != NULL) {
BOOL isfirst = ;
NSLog(@"view at [%p] is a %@, isFirstResponder=%d", uiv, uiv.class, isfirst);
uiv = uiv.superview;
}
NSLog(@"view at [%p] is a %@", uiv, uiv.class);
NSLog(@"End of view hierarchy");
}
@end
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>有一个更简单的方法。在 <code>didSelectRowAtIndexPath</code> 中存储对当前单元格的 UITextField 的引用。然后您可以将其设置为第一响应者，处理编辑等。</p>
<p>当您点击一个新单元格以选择它时，代理首先会收到一个 <code>didDeselectRowAtIndexPath</code>。在这里，您可以使用您的 UITextField 引用可以辞职第一响应者，保存任何必要的状态等。然后在新单元格上调用 <code>didDeselectRowAtIndexPath</code> ，您就可以开始了。所以类似于以下内容:</p>
<p><strong>编辑:添加额外代码</strong></p>
<pre><code>// Code additions to Xcode's Master-Detail application template
// Use dynamic prototypes for table cells, custom cell class follows:
// MyCell.h
// Property is auto-synthesized, so there is nothing to see in MyCell.m
@interface MyCell : UITableViewCell
@property (nonatomic, weak) IBOutlet UITextField *tf;
@end
// MasterViewController.m
@interface MasterViewController () {
NSMutableArray *_objects;
}
@property (nonatomic, weak) UITextField *selectedField;
@end
// this method is called when a cell is DE-selected
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
;
// save state, etc if necessary
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCell * cell = (MyCell *);
self.selectedField = cell.tf; // cell.tf is a UITextField property defined on MyCell
;
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 在 iOS 中，如何在两个单元格中的文本字段之间切换？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/18581173/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/18581173/
</a>
</p>
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