iOS中管理剪切板的UIPasteboard粘贴板类用法详解

//获取系统级别的剪切板
+ (UIPasteboard *)generalPasteboard;
//获取一个自定义的剪切板 name参数为此剪切板的名称 create参数用于设置当这个剪切板不存在时 是否进行创建
+ (nullable UIPasteboard *)pasteboardWithName:(NSString *)pasteboardName create:(BOOL)create;
//获取一个应用内可用的剪切板
+ (UIPasteboard *)pasteboardWithUniqueName;

//剪切板的名称
@property(readonly,nonatomic) NSString *name;
//根据名称删除一个剪切板
+ (void)removePasteboardWithName:(NSString *)pasteboardName;
//是否进行持久化
@property(getter=isPersistent,nonatomic) BOOL persistent;
//此剪切板的改变次数 系统级别的剪切板只有当设备重新启动时 这个值才会清零
@property(readonly,nonatomic) NSInteger changeCount;

//获取剪切板中最新数据的类型
- (NSArray<NSString *> *)pasteboardTypes;
//获取剪切板中最新数据对象是否包含某一类型的数据
- (BOOL)containsPasteboardTypes:(NSArray<NSString *> *)pasteboardTypes;
//将剪切板中最新数据对象某一类型的数据取出
- (nullable NSData *)dataForPasteboardType:(NSString *)pasteboardType;
//将剪切板中最新数据对象某一类型的值取出
- (nullable id)valueForPasteboardType:(NSString *)pasteboardType;
//为剪切板中最新数据对应的某一数据类型设置值
- (void)setValue:(id)value forPasteboardType:(NSString *)pasteboardType;
//为剪切板中最新数据对应的某一数据类型设置数据
- (void)setData:(NSData *)data forPasteboardType:(NSString *)pasteboardType;
多组数据对象的存取：

//数据组数
@property(readonly,nonatomic) NSInteger numberOfItems;
//获取一组数据对象包含的数据类型
- (nullable NSArray *)pasteboardTypesForItemSet:(nullable NSIndexSet*)itemSet;
//获取一组数据对象中是否包含某些数据类型
- (BOOL)containsPasteboardTypes:(NSArray<NSString *> *)pasteboardTypes inItemSet:(nullable NSIndexSet *)itemSet;
//根据数据类型获取一组数据对象
- (nullable NSIndexSet *)itemSetWithPasteboardTypes:(NSArray *)pasteboardTypes;
//根据数据类型获取一组数据的值
- (nullable NSArray *)valuesForPasteboardType:(NSString *)pasteboardType inItemSet:(nullable NSIndexSet *)itemSet;
//根据数据类型获取一组数据的NSData数据
- (nullable NSArray *)dataForPasteboardType:(NSString *)pasteboardType inItemSet:(nullable NSIndexSet *)itemSet;
//所有数据对象
@property(nonatomic,copy) NSArray *items;
//添加一组数据对象
- (void)addItems:(NSArray<NSDictionary<NSString *, id> *> *)items;

//所有字符串类型数据的类型定义字符串数组
UIKIT_EXTERN NSArray<NSString *> *UIPasteboardTypeListString;
//所有URL类型数据的类型定义字符串数组
UIKIT_EXTERN NSArray<NSString *> *UIPasteboardTypeListURL;
//所有图片数据的类型定义字符串数据
UIKIT_EXTERN NSArray<NSString *> *UIPasteboardTypeListImage;
//所有颜色数据的类型定义字符串数组
UIKIT_EXTERN NSArray<NSString *> *UIPasteboardTypeListColor;

//获取或设置剪切板中的字符串数据
@property(nullable,nonatomic,copy) NSString *string;
//获取或设置剪切板中的字符串数组
@property(nullable,nonatomic,copy) NSArray<NSString *> *strings;
//获取或设置剪切板中的URL数据
@property(nullable,nonatomic,copy) NSURL *URL;
//获取或设置剪切板中的URL数组
@property(nullable,nonatomic,copy) NSArray<NSURL *> *URLs;
//获取或s何止剪切板中的图片数据
@property(nullable,nonatomic,copy) UIImage *image;
//获取或设置剪切板中的图片数组
@property(nullable,nonatomic,copy) NSArray<UIImage *> *images;
//获取或设置剪切板中的颜色数据
@property(nullable,nonatomic,copy) UIColor *color;
//获取或设置剪切板中的颜色数组
@property(nullable,nonatomic,copy) NSArray<UIColor *> *colors;
对剪切板的某些操作会触发如下通知：

//剪切板内容发生变化时发送的通知
UIKIT_EXTERN NSString *const UIPasteboardChangedNotification;
//剪切板数据类型键值增加时发送的通知
UIKIT_EXTERN NSString *const UIPasteboardChangedTypesAddedKey;
//剪切板数据类型键值移除时发送的通知
UIKIT_EXTERN NSString *const UIPasteboardChangedTypesRemovedKey;
//剪切板被删除时发送的通知
UIKIT_EXTERN NSString *const UIPasteboardRemovedNotification;

#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