iOS 封装一个带复制功能的UILabel

我们发现UILabel不在为我们提供长按弹出复制等操作了, 我们来继承UILabel自己写一个带复制功能的UILabel。

代码：

#import "CopyLabel.h"

@implementation CopyLabel

- (instancetype)initWithFrame:(CGRect)frame {

    if (self = [super initWithFrame:frame]) {
        [self pressAction];
    }
    return self;
}

// 初始化设置
- (void)pressAction {

    self.userInteractionEnabled = YES;
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
    longPress.minimumPressDuration = 0.25;
    [self addGestureRecognizer:longPress];
}

// 使label能够成为响应事件
- (BOOL)canBecomeFirstResponder {

    return YES;
}

// 自定义方法时才显示对就选项菜单，即屏蔽系统选项菜单
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {

    if (action == @selector(customCopy:)){

        return YES;
    }
    return NO;
}

- (void)customCopy:(id)sender {

    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    pasteboard.string = self.text;
}

- (void)longPressAction:(UIGestureRecognizer *)recognizer {

    if (recognizer.state == UIGestureRecognizerStateBegan) {
        [self becomeFirstResponder];
        UIMenuItem *copyItem = [[UIMenuItem alloc] initWithTitle:@"拷贝" action:@selector(customCopy:)];
        UIMenuController *menuController = [UIMenuController sharedMenuController];
        menuController.menuItems = [NSArray arrayWithObjects:copyItem, nil];
        [menuController setTargetRect:self.frame inView:self.superview];
        [menuController setMenuVisible:YES animated:YES];
    }
}

@end

使用：

- (void)viewDidLoad {
   [super viewDidLoad];

   CopyLabel *copy = [[CopyLabel alloc] initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width,50)];
   copy.text = @"一个带复制功能的Label";
   copy.textAlignment = NSTextAlignmentCenter;
   copy.backgroundColor = [UIColor yellowColor];
   copy.textColor = [UIColor redColor];
   copy.font = [UIFont boldSystemFontOfSize:16];
   [self.view addSubview:copy];
}