iOS中管理剪切板的UIPasteboard粘贴板类用法详解

三、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