UIMenuController

Posted 2020-08-02

UIMenuController的示例

 

UIMenuController须知

• 默认情况下, 有以下控件已经支持UIMenuController
• UITextField
• UITextView
• UIWebView

让其他控件也支持UIMenuController(比如UILabel)

• 自定义UILabel
• 重写2个方法

```objc /* * 让label有资格成为第一响应者/ - (BOOL)canBecomeFirstResponder { return YES; }

/* * label能执行哪些操作(比如copy, paste等等) * @return YES:支持这种操作/ - (BOOL)canPerformAction:(SEL)action withSender:(id)sender { if (action == @selector(cut:) || action == @selector(copy:) || action == @selector(paste:)) return YES;

return NO;

} ```

• 实现各种操作方法

```objc - (void)cut:(UIMenuController *)menu { // 将自己的文字复制到粘贴板 [self copy:menu];

// 清空文字

self.text = nil;

}

• (void)copy:(UIMenuController )menu { // 将自己的文字复制到粘贴板 UIPasteboard board = [UIPasteboard generalPasteboard]; board.string = self.text; }
• (void)paste:(UIMenuController )menu { // 将粘贴板的文字复制到自己身上 UIPasteboard board = [UIPasteboard generalPasteboard]; self.text = board.string; } ```
• 让label成为第一响应者

objc // 这里的self是label [self becomeFirstResponder];

• 显示UIMenuController

objc UIMenuController *menu = [UIMenuController sharedMenuController]; // targetRect: MenuController需要指向的矩形框 // targetView: targetRect会以targetView的左上角为坐标原点 [menu setTargetRect:self.bounds inView:self]; // [menu setTargetRect:self.frame inView:self.superview]; [menu setMenuVisible:YES animated:YES];

自定义UIMenuController内部的Item

• 添加item

objc // 添加MenuItem(点击item, 默认会调用控制器的方法) UIMenuItem *ding = [[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding:)]; UIMenuItem *replay = [[UIMenuItem alloc] initWithTitle:@"回复" action:@selector(replay:)]; UIMenuItem *report = [[UIMenuItem alloc] initWithTitle:@"举报" action:@selector(report:)]; menu.menuItems = @[ding, replay, report];  

 

 

 

代码示例

一、让label有menu，需要自定义label

- (void)awakeFromNib

{

    [self setup];

}

- (instancetype)initWithFrame:(CGRect)frame

{

    if (self = [super initWithFrame:frame]) {

        [self setup ];

    }

    return self;

}

 

- (void)setup

{

    //label一定要可以交互

    self.userInteractionEnabled = YES;

    [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(click)]];

}

 

/**

 *  让label有资格成为第一响应者

 */

- (BOOL)canBecomeFirstResponder

{

    return YES;

}

/**

 *  label能执行哪个操作（比如copy、paste）等

 */

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender

{

    //只返回YES支持所有操作

    if (action == @selector(cut:) || action == @selector(copy:) || action == @selector(paste:)) {

        return YES;

    }

    

//    自定义menu的时候，这里放回NO就行了

    return NO;

}

/**

 *  剪切方法

 */

- (void)cut:(UIMenuController *)menu

{   

    //将文字保存到粘贴板

    UIPasteboard *pasteBoard = [UIPasteboard generalPasteboard];

    pasteBoard.string = self.text;

    

    //清空label的文字

    self.text = nil;

}

- (void)copy:(UIMenuController *)menu

{

    //将文字保存到粘贴板

    UIPasteboard *pasteBoard = [UIPasteboard generalPasteboard];

    pasteBoard.string = self.text;

    

}

// 粘贴

- (void)paste:(UIMenuController *)menu

{

    //将文字保存到粘贴板

    UIPasteboard *pasteBoard = [UIPasteboard generalPasteboard];

    self.text = pasteBoard.string;

}

 

 

 

 

- (void)click

{

    //1、让label成为第一响应者

    [self becomeFirstResponder];

    

    //2、显示MenuController

    UIMenuController *menu = [UIMenuController sharedMenuController];

    //menu围着哪个区域显示，显示上下左右由系统决定

    //[menu setTargetRect:self.frame inView:self.superview];

    //或者

    [menu setTargetRect:self.bounds inView:self];

    

    //自定义menu

    

 

    //显示menu菜单

    [menu setMenuVisible:YES animated:YES];

}

 

 

二、自定义menu

UILabel *secondLabel = [[UILabel alloc] init];

    secondLabel.frame = CGRectMake(100, 200, 100, 50);

    secondLabel.backgroundColor = [UIColor yellowColor];

    [secondLabel addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickPP)]];

    secondLabel.text = @"ppppppp";

    secondLabel.userInteractionEnabled = YES;

    self.label = customLabel;

    [self.view addSubview:secondLabel];

    self.label = secondLabel;

 

- (void)clickPP

{

    //1、让label成为第一响应者

    [self becomeFirstResponder];

    

    //2、显示MenuController

    UIMenuController *menu = [UIMenuController sharedMenuController];

    //menu围着哪个区域显示，显示上下左右由系统决定

    //[menu setTargetRect:self.frame inView:self.superview];

    //或者

    [menu setTargetRect:self.label.bounds inView:self.label];

    

    //自定义menu

    //自定义menu的按钮方法必须放在控制器中

    UIMenuItem *ding = [[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding:)];

    UIMenuItem *replay = [[UIMenuItem alloc] initWithTitle:@"回复" action:@selector(replay:)];

    UIMenuItem *report = [[UIMenuItem alloc] initWithTitle:@"举报" action:@selector(report:)];

    menu.menuItems = @[ding,replay,report];

    //显示menu菜单

    [menu setMenuVisible:YES animated:YES];

}

 

/**

 *  让label有资格成为第一响应者

 */

- (BOOL)canBecomeFirstResponder

{

    return YES;

}

 

 

/**

 *  顶

 */

- (void)ding:(UIMenuController *)meun

{

    NSLog(@"ding");

}

 

/**

 *  顶

 */

- (void)replay:(UIMenuController *)meun

{

     NSLog(@"replay");

}

 

/**

 *  顶

 */

- (void)report:(UIMenuController *)meun

{

     NSLog(@"report");

}