当用户在表格视图中滑动单元格时，如何创建一个“更多”按钮(就像ios 7中的邮件应用程序)
我一直在这里和Cocoa Touch论坛上寻找这些信息，但我似乎找不到答案，我希望比我更聪明的人能给我一个解决方案。
我希望当用户滑动一个表格视图单元格时，显示多个编辑按钮(默认是删除按钮)。 在iOS 7的邮件应用程序中，你可以滑动删除，但会出现一个“更多”按钮。
当前回答
Swift 4和iOs 11+
@available(iOS 11.0, *)
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let delete = UIContextualAction(style: .destructive, title: "Delete") { _, _, handler in
handler(true)
// handle deletion here
}
let more = UIContextualAction(style: .normal, title: "More") { _, _, handler in
handler(true)
// handle more here
}
return UISwipeActionsConfiguration(actions: [delete, more])
}
其他回答
这里有一个简单的解决办法。它能够在UITableViewCell中显示和隐藏自定义UIView。 显示逻辑包含在从UITableViewCell, BaseTableViewCell扩展的类中。
BaseTableViewCell.h
#import <UIKit/UIKit.h>
@interface BaseTableViewCell : UITableViewCell
@property(nonatomic,strong)UIView* customView;
-(void)showCustomView;
-(void)hideCustomView;
@end
BaseTableViewCell。米
#import "BaseTableViewCell.h"
@interface BaseTableViewCell()
{
BOOL _isCustomViewVisible;
}
@end
@implementation BaseTableViewCell
- (void)awakeFromNib {
// Initialization code
}
-(void)prepareForReuse
{
self.customView = nil;
_isCustomViewVisible = NO;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(void)showCustomView
{
if(nil != self.customView)
{
if(!_isCustomViewVisible)
{
_isCustomViewVisible = YES;
if(!self.customView.superview)
{
CGRect frame = self.customView.frame;
frame.origin.x = self.contentView.frame.size.width;
self.customView.frame = frame;
[self.customView willMoveToSuperview:self.contentView];
[self.contentView addSubview:self.customView];
[self.customView didMoveToSuperview];
}
__weak BaseTableViewCell* blockSelf = self;
[UIView animateWithDuration:.5 animations:^(){
for(UIView* view in blockSelf.contentView.subviews)
{
CGRect frame = view.frame;
frame.origin.x = frame.origin.x - blockSelf.customView.frame.size.width;
view.frame = frame;
}
}];
}
}
}
-(void)hideCustomView
{
if(nil != self.customView)
{
if(_isCustomViewVisible)
{
__weak BaseTableViewCell* blockSelf = self;
_isCustomViewVisible = NO;
[UIView animateWithDuration:.5 animations:^(){
for(UIView* view in blockSelf.contentView.subviews)
{
CGRect frame = view.frame;
frame.origin.x = frame.origin.x + blockSelf.customView.frame.size.width;
view.frame = frame;
}
}];
}
}
}
@end
要获得此功能，只需从BaseTableViewCell扩展您的表视图单元格。
接下来, 在UIViewController中，它实现了UITableViewDelegate，创建了两个手势识别器来处理左右滑动。
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.tableView registerNib:[UINib nibWithNibName:CUSTOM_CELL_NIB_NAME bundle:nil] forCellReuseIdentifier:CUSTOM_CELL_ID];
UISwipeGestureRecognizer* leftSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSwipe:)];
leftSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.tableView addGestureRecognizer:leftSwipeRecognizer];
UISwipeGestureRecognizer* rightSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSwipe:)];
rightSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.tableView addGestureRecognizer:rightSwipeRecognizer];
}
然后添加两个滑动处理程序
- (void)handleLeftSwipe:(UISwipeGestureRecognizer*)recognizer
{
CGPoint point = [recognizer locationInView:self.tableView];
NSIndexPath* index = [self.tableView indexPathForRowAtPoint:point];
UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:index];
if([cell respondsToSelector:@selector(showCustomView)])
{
[cell performSelector:@selector(showCustomView)];
}
}
- (void)handleRightSwipe:(UISwipeGestureRecognizer*)recognizer
{
CGPoint point = [recognizer locationInView:self.tableView];
NSIndexPath* index = [self.tableView indexPathForRowAtPoint:point];
UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:index];
if([cell respondsToSelector:@selector(hideCustomView)])
{
[cell performSelector:@selector(hideCustomView)];
}
}
现在，在UITableViewDelegate的cellForRowAtIndexPath中，你可以创建自定义UIView并将它附加到dequeuedcell中。
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
CustomCellTableViewCell* cell = (CustomCellTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"CustomCellTableViewCell" forIndexPath:indexPath];
NSArray* nibViews = [[NSBundle mainBundle] loadNibNamed:@"CellCustomView"
owner:nil
options:nil];
CellCustomView* customView = (CellCustomView*)[ nibViews objectAtIndex: 0];
cell.customView = customView;
return cell;
}
当然，这种加载自定义UIView的方式只适用于这个例子。按照您的意愿管理它。
在iOS 11中，这在UITableViewDelegate中是公开的。下面是一些示例代码:
斯威夫特
func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let action = UIContextualAction(style: .normal, title: nil) { (_, _, _) in
print("Swipe action tapped")
}
action.image = UIImage(systemName: "plus.slash.minus")
action.backgroundColor = .green
return UISwipeActionsConfiguration(actions: [action])
}
Objective - C
- (UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath {
UIContextualAction *delete = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleDestructive
title:@"DELETE"
handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
NSLog(@"index path of delete: %@", indexPath);
completionHandler(YES);
}];
UIContextualAction *rename = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal
title:@"RENAME"
handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
NSLog(@"index path of rename: %@", indexPath);
completionHandler(YES);
}];
UISwipeActionsConfiguration *swipeActionConfig = [UISwipeActionsConfiguration configurationWithActions:@[rename, delete]];
swipeActionConfig.performsFirstActionWithFullSwipe = NO;
return swipeActionConfig;
}
也可用:
- (UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath;
文档:https://developer.apple.com/documentation/uikit/uitableviewdelegate/2902367-tableview?language=objc
你需要子类化UITableViewCell和子类化方法willTransitionToState:(UITableViewCellStateMask)状态，该状态在用户滑动单元格时被调用。状态标志会让你知道是否显示删除按钮，并在那里显示/隐藏更多按钮。
不幸的是，这个方法既没有给你Delete按钮的宽度，也没有给你动画时间。所以你需要观察并将More按钮的帧和动画时间硬编码到你的代码中(我个人认为苹果需要在这方面做些什么)。
Swift 4和iOs 11+
@available(iOS 11.0, *)
override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let delete = UIContextualAction(style: .destructive, title: "Delete") { _, _, handler in
handler(true)
// handle deletion here
}
let more = UIContextualAction(style: .normal, title: "More") { _, _, handler in
handler(true)
// handle more here
}
return UISwipeActionsConfiguration(actions: [delete, more])
}
Swift 3版本代码，不使用任何库:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableView.tableFooterView = UIView(frame: CGRect.zero) //Hiding blank cells.
tableView.separatorInset = UIEdgeInsets.zero
tableView.dataSource = self
tableView.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 4
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: "tableCell", for: indexPath)
return cell
}
//Enable cell editing methods.
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
let more = UITableViewRowAction(style: .normal, title: "More") { action, index in
//self.isEditing = false
print("more button tapped")
}
more.backgroundColor = UIColor.lightGray
let favorite = UITableViewRowAction(style: .normal, title: "Favorite") { action, index in
//self.isEditing = false
print("favorite button tapped")
}
favorite.backgroundColor = UIColor.orange
let share = UITableViewRowAction(style: .normal, title: "Share") { action, index in
//self.isEditing = false
print("share button tapped")
}
share.backgroundColor = UIColor.blue
return [share, favorite, more]
}
}
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