UIMenuController的使用，对UILabel拷贝以及定制菜单

1. Menu所处的View必须实现 – (BOOL)canBecomeFirstResponder, 且返回YES

2. Menu所处的View必须实现 – (BOOL)canPerformAction:withSender, 并根据需求返回YES或NO

3. 使Menu所处的View成为First Responder (becomeFirstResponder)

4. 定位Menu (- setTargetRect:inView:)

5. 展示Menu (- setMenuVisible:animated:)

@implementation UICopyLabel

// default is NO
- (BOOL)canBecomeFirstResponder{
    return YES;
}

//"反馈"关心的功能  
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{  
    return (action == @selector(copy:));  
}  
//针对于copy的实现  
-(void)copy:(id)sender{  
    UIPasteboard *pboard = [UIPasteboard generalPasteboard];  
    pboard.string = self.text;  
} 

//UILabel默认是不接收事件的，我们需要自己添加touch事件  
-(void)attachTapHandler{  
    self.userInteractionEnabled = YES;  //用户交互的总开关  
    UITapGestureRecognizer *touch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];  
    touch.numberOfTapsRequired = 2;  
    [self addGestureRecognizer:touch];  
    [touch release];  
}  
//绑定事件  
- (id)initWithFrame:(CGRect)frame  
{  
    self = [super initWithFrame:frame];  
    if (self) {  
        [self attachTapHandler];  
    }  
    return self;  
}  
//同上  
-(void)awakeFromNib{  
    [super awakeFromNib];  
    [self attachTapHandler];  
}

-(void)handleTap:(UIGestureRecognizer*) recognizer{  
    [self becomeFirstResponder];  
    UIMenuController *menu = [UIMenuController sharedMenuController];  
    [menu setTargetRect:self.frame inView:self.superview];  
    [menu setMenuVisible:YES animated:YES];  
} 


@end

在view里添加一个UICopyLabel

现在可以使用UICopyLabel实现双击来对label的内容copy了

在你的view中

UICopyLabel *display = [[UICopyLabelalloc]initWithFrame:CGRectMake(30,100,250,30)];

awakeFromNib

在使用IB的时候才会涉及到此方法的使用，当.nib文件被加载的时候，会发送一个awakeFromNib的消息到.nib文件中的每个对象，每个对象都可以定义自己的awakeFromNib函数来响应这个消息，执行一些必要的操作。

看例子：

创建一个viewController with XIB

定义一个UIView的子类

打开xib，并把View的类型指定为上一步骤定义的子类

然后在TestView.m中加入 awakeFromNib方法，运行程序发现此方法被调用了！！！

下面我们来定制菜单

在attachTapHandler中添加长按压手势

-(void)attachTapHandler{  
    self.userInteractionEnabled = YES;  //用户交互的总开关  
    //双击
    UITapGestureRecognizer *touch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];  
    touch.numberOfTapsRequired = 2;  
    [self addGestureRecognizer:touch]; 
     [touch release]; 
    
    //长按压
    UILongPressGestureRecognizer *press = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
    press.minimumPressDuration = 1.0;
    [self addGestureRecognizer:press];
    [press release];
    
} 

添加方法longPress

- (void)longPress:(UILongPressGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
//	 TSTableViewCell *cell = (TSTableViewCell *)recognizer.view;
        [self becomeFirstResponder];
        UIMenuItem *flag = [[UIMenuItem alloc] initWithTitle:@"Flag" action:@selector(flag:)];
        UIMenuItem *approve = [[UIMenuItem alloc] initWithTitle:@"Approve" action:@selector(approve:)];
UIMenuItem *deny = [[UIMenuItem alloc] initWithTitle:@"Deny" action:@selector(deny:)];
        
        UIMenuController *menu = [UIMenuController sharedMenuController];
[menu setMenuItems:[NSArray arrayWithObjects:flag, approve, deny, nil]];
[menu setTargetRect:self.frame inView:self.superview];
        [menu setMenuVisible:YES animated:YES];
         NSLog(@"menuItems:%@",menu.menuItems);
}
}

- (void)flag:(id)sender {
NSLog(@"Cell was flagged");
}

- (void)approve:(id)sender {
NSLog(@"Cell was approved");
}

- (void)deny:(id)sender {
NSLog(@"Cell was denied");
}

修改canPerformAction

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{  
//    return (action == @selector(copy:));  
    if (action == @selector(copy:)||action == @selector(flag:)||action == @selector(approve:)||action == @selector(deny:)) {
        return YES;
    }
}

ok。。。效果如图