label实现复制功能

label实现复制功能,通过子类实现的,当然也可以用分类

#import "YJCLabel.h"

@implementation YJCLabel

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

- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        [self addLongGR];
    }
    return self;
}

- (instancetype)init{
    if (self = [super init]) {
        [self addLongGR];
    }
    return self;
}

//添加长按手势
- (void)addLongGR{
    self.userInteractionEnabled = YES;
    UILongPressGestureRecognizer *lpr = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressGR:)];
    [self addGestureRecognizer:lpr];
}
//长按手势实现
-(void)longPressGR:(UIGestureRecognizer*) recognizer
{
    [self becomeFirstResponder];
    UIMenuItem *copyItem = [[UIMenuItem alloc]initWithTitle:@"复制" action:@selector(copyText:)];//注意名字不能与系统默认的copy相同,要不然会显示一个title为copy的item
    UIMenuItem *pasteItem = [[UIMenuItem alloc]initWithTitle:@"粘贴" action:@selector(pasteText:)];
    [[UIMenuController sharedMenuController] setMenuItems:@[copyItem,pasteItem]];//这儿需要判断一下粘贴板有没有文字,哈哈偷懒
    [[UIMenuController sharedMenuController]setTargetRect:self.frame inView:self.superview];//还有个menuFrame属性
    [[UIMenuController sharedMenuController] setMenuVisible:YES animated:YES];
}
//复制文本
- (void)copyText:(id)sender{
    [UIPasteboard generalPasteboard].string = self.text;
}
//粘贴文本
- (void)pasteText:(id)sender{
    self.text = [UIPasteboard generalPasteboard].string;
}
//允许成为第一响应者,默认NO
- (BOOL)canBecomeFirstResponder{
    return YES;
}
//判断操作是不是自己想要的
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    return (action == @selector(copyText:) || action == @selector(pasteText:));
}

@end

注意与表类族之间的响应交换,如果没有特殊的要求,还是用textView吧哈哈