ios开发 UIPasteboard 的简单使用

作者: charlesLaw | 来源:发表于2016-01-19 16:24 被阅读9179次

    1.概述

    UIPasteboard是ios中访问粘贴板的原生控件,可分为系统等级的和app等级的,系统等级的独立于app,可以复制一个app的内容到另一个app;app等级的只能在app内进行复制和粘贴;它们分别由+ (nullable UIPasteboard *)pasteboardWithName:(NSString *)pasteboardName create:(BOOL)create这两个类方法进行创建。

    2.数据类型

    可以复制在粘贴板的数据类型有NSString、UIImage、NSURL、UIColor、NSData以及由这些类型元素组成的数组。可分别由它们的set方法将数据放在粘贴板中,如NSString:

    UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
    [pasteboard setString:@"复制的字符串内容"];
    

    3.认识常用方法

    /*通过名称获取粘贴板并且移除*/
    + (void)removePasteboardWithName:(NSString *)pasteboardName; 
    /*从粘贴板中获取数据,pasteboardType是自定义的,说明app可以处理哪种类型的数据*/
    - (nullable NSData *)dataForPasteboardType:(NSString *)pasteboardType; 
    /*data类型的数据放在粘贴板中,pasteboardType同上*/
    - (void)setData:(NSData *)data forPasteboardType:(NSString *)pasteboardType;
    /*从粘贴板中取出data*/
    - (nullable NSData *)dataForPasteboardType:(NSString *)pasteboardType;
    

    4.使用方法

    在ios中,支持UIPasteboard原生控件只有UITextField 、UITextView、UIWebView这三个,如果想自定义一个控件能够使用UIPasteboard,需要在定义的时候重载 -(BOOL)canBecomeFirstResponder-(BOOL)canPerformAction:(SEL)action withSender:(id)sender这两个方法,前者设置控件可称为第一响应器,后者决定这个控件能够使用复制、剪切、选中、全选、粘贴等的哪一种或几种功能,并重载对应的-(void)copy:(id)sender-(void)cut:(id)sender-(void)select:(id)sender-(void)selectAll:(id)sender-(void)paste:(id)sender方法,在这几个方法中处理事件,UIMenuController负责显示UI。

    5.复制图片的简单例子

    创建一个CopyView
    #import "CopyView.h"
    @interface CopyView ()
    @property (strong, nonatomic) UIImageView* img1;
    @property (strong, nonatomic) UIImageView* img2;
    @end

    @implementation CopyView
    -(UIImageView *)img1{
        if (_img1 == nil) {
            _img1 = [[UIImageView alloc] initWithFrame:CGRectMake(10.0f, 20.0f, 100.0f, 100.0f)];
            NSString* path = [[NSBundle mainBundle] pathForResource:@"NetworldImage" ofType:@"jpg"];
            _img1.image = [UIImage imageWithContentsOfFile:path];
        }
        return _img1;
    }
    
    -(UIImageView *)img2{
        if (_img2 == nil) {
              _img2 = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.img1.frame)+50.0f, 20.0f, 100.0f, 100.0f)];
            _img2.backgroundColor = [UIColor lightGrayColor];
        }
        return _img2;
    }
    
    - (instancetype)initWithFrame:(CGRect)frame {
        self = [super initWithFrame:frame];
        if (self) {
            self.backgroundColor = [UIColor whiteColor];
            [self addSubview:self.img1];
            [self addSubview:self.img2];
        }
        return self;
    }
    
    -(BOOL)canBecomeFirstResponder{
        return YES;
    }
    -(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
        NSArray* methodNameArr = @[@"copy:",@"cut:",@"select:",@"selectAll:",@"paste:"];
        if ([methodNameArr containsObject:NSStringFromSelector(action)]) {
            return YES;
        }
        return [super canPerformAction:action withSender:sender];
    }
    
    -(void)copy:(id)sender{
        UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
        [pasteboard setImage:self.img1.image];
    }
    
    -(void)paste:(id)sender{
        UIPasteboard* pasteboard = [UIPasteboard generalPasteboard];
        self.img2.image = [pasteboard image];
    }
    
    -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
        [self becomeFirstResponder];
        UIMenuController* menuController = [UIMenuController sharedMenuController];
        [menuController setTargetRect:self.img1.frame inView:self];
        [menuController setMenuVisible:YES animated:YES];
    }
    
    @end
    

    在controller中
    #import "ViewController.h"
    #import "CopyView.h"

    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        CopyView* cv = [[CopyView alloc] initWithFrame:self.view.bounds];
        self.view = cv;
    }
    
    @end
    

    效果展示

    屏幕快照 2016-01-19 下午4.21.09.png 屏幕快照 2016-01-19 下午4.21.33.png

    相关文章

      网友评论

      • 5ec1da87f063:它们分别由+ (nullable UIPasteboard *)pasteboardWithName:(NSString *)pasteboardName create:(BOOL)create这两个类方法进行创建。 这不就是一个方法吗?
      • 8f2a403445f4:可以,不错:blush:
      • 无wu:先mark下
      • HelloDarry:太棒了,最近正好在做这个

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