UI基础--UILabel

苹果在iOS8之后,UILabel这个控件不在给我们提供好长按进行复制的操作,接下来我们自己写一个关于复制Lable上面的文字;

创建一个label继承UILabel;

代码如下:

-(BOOL)canBecomeFirstResponder {
    
    return YES;
}

// 可以响应的方法
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    
    return (action == @selector(copy:));
}

//针对于响应方法的实现
-(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;
    UILongPressGestureRecognizer *touch = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
    [self addGestureRecognizer:touch];
}

//绑定事件
- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        
        [self attachTapHandler];
    }
    return self;
}

-(void)awakeFromNib {
    
    [super awakeFromNib];
    [self attachTapHandler];
}

-(void)handleTap:(UIGestureRecognizer*) recognizer {
    
    [self becomeFirstResponder];
    UIMenuItem *copyLink = [[UIMenuItem alloc] initWithTitle:@"复制"
                                                      action:@selector(copy:)];
    [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObjects:copyLink, nil]];
    [[UIMenuController sharedMenuController] setTargetRect:self.frame inView:self.superview];
    [[UIMenuController sharedMenuController] setMenuVisible:YES animated: YES];
}

这样就可以实现了.

下面这段代码是改变Label上面的文字颜色

 NSMutableAttributedString *noteStr = [[NSMutableAttributedString alloc] initWithString:@"我:是"];
    NSRange redRange = NSMakeRange(0, [[noteStr string] rangeOfString:@":"].location);
    [noteStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:redRange];
    [label setAttributedText:noteStr] ;