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UIMenuController的使用,对UILabel拷贝以及定制菜单

2014-10-27 20:30 113 查看
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

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];

}

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");

}

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;

}

}

ok。。。效果如图



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