iOS如何封装带复制功能的UILabel示例代码

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我是靠谱客的博主发嗲煎蛋，这篇文章主要介绍iOS如何封装带复制功能的UILabel示例代码，现在分享给大家，希望可以做个参考。

前言

UILabel继承自UIView是iOS中使用非常频繁的一个视图控件一般用于显示文字。

一：基本使用

1.创建

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UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(20, 64, 100, 30)];
[self.view addSubview:label];

2.属性设置

在iOS中你想要使用一个属性一般就直接“.”属性英文名称，或者“set”属性英文名称一般就可以出现

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label.backgroundColor = [UIColor yellowColor];//设置背景颜色
label.textColor = [UIColor redColor];//设置Label上文字的颜色
label.text = @"我是一个UILabel";//设置Label上的文字
label.font = [UIFont systemFontOfSize:15];//设置Label上文字的大小 默认为17
label.textAlignment = NSTextAlignmentCenter;//设置文字位子默认靠左
label.numberOfLines = 0;//设置行数默认为1，当为0时可以就是设置多行
label.font = [UIFont fontWithName:@"Arial" size:30];//设置内容字体和字体大小
label.highlighted = YES;//Label是否高亮

//有时偶尔会使用到阴影设置
label.shadowColor = [UIColor blueColor];//设置阴影颜色
label.shadowOffset = CGSizeMake(10, 10);//设置阴影的偏移

二、在iOS中下面三个控件，自身就有复制-粘贴的功能：

1、UITextView

2、UITextField

3、UIWebView

在iOS8 之后, 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

三、废话少说，直接撸代码

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#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

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#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

四、废话少说，直接看效果

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- (void)viewDidLoad {
 [super viewDidLoad];
 CopyLabel *copy = [[CopyLabel alloc] initWithFrame:CGRectMake(0, 100, [UIScreen mainScreen].bounds.size.width,50)];
 copy.text = @"清明时节雨纷纷，路上行人欲断魂。";
 copy.textAlignment = NSTextAlignmentCenter;
 copy.backgroundColor = [UIColor yellowColor];
 copy.textColor = [UIColor redColor];
 copy.font = [UIFont boldSystemFontOfSize:16];
 [self.view addSubview:copy];
}