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:)

[cpp]
view plaincopyprint?

@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

@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[b]attachTapHandler中添加长按压手势[/b]

[cpp]
view plaincopyprint?

-(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];

}

-(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

[cpp]
view plaincopyprint?

- (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");
}

- (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

[cpp]
view plaincopyprint?

-(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;
}
}

-(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