label實現複製功能

label實現複製功能,經過子類實現的,固然也能夠用分類

#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;
}

//添加長按手勢
- (void)addLongGR{
    self.userInteractionEnabled = YES;
    UILongPressGestureRecognizer *lpr = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressGR:)];
    [self addGestureRecognizer:lpr];
}
//長按手勢實現
-(void)longPressGR:(UIGestureRecognizer*) recognizer
{
    [self becomeFirstResponder];
    UIMenuItem *copyItem = [[UIMenuItem alloc]initWithTitle:@"複製" action:@selector(copyText:)];//注意名字不能與系統默認的copy相同,要否則會顯示一個title爲copy的item
    UIMenuItem *pasteItem = [[UIMenuItem alloc]initWithTitle:@"粘貼" action:@selector(pasteText:)];
    [[UIMenuController sharedMenuController] setMenuItems:@[copyItem,pasteItem]];//這兒須要判斷一下粘貼板有沒有文字,哈哈偷懶
    [[UIMenuController sharedMenuController]setTargetRect:self.frame inView:self.superview];//還有個menuFrame屬性
    [[UIMenuController sharedMenuController] setMenuVisible:YES animated:YES];
}
//複製文本
- (void)copyText:(id)sender{
    [UIPasteboard generalPasteboard].string = self.text;
}
//粘貼文本
- (void)pasteText:(id)sender{
    self.text = [UIPasteboard generalPasteboard].string;
}
//容許成爲第一響應者,默認NO
- (BOOL)canBecomeFirstResponder{
    return YES;
}
//判斷操做是否是本身想要的
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    return (action == @selector(copyText:) || action == @selector(pasteText:));
}

@end

注意與表類族之間的響應交換,若是沒有特殊的要求,仍是用textView吧哈哈