自定义UIMenuController(二)

上一篇文章已经提到,在用系统的UIMenuController无法实现需求要的效果:

Paste_Image.png

因此要自定义UIMenuController,具体代码如下:

• 在.h文件中

  #import <UIKit/UIKit.h>
  @interface XJLabel : UILabel
   @end

• 在.m文件中

  #import "XJLabel.h"
   @implementation XJLabel

  - (void)awakeFromNib {
        [super awakeFromNib];
         [self setup];
  }
  - (instancetype)initWithFrame:(CGRect)frame  {
        if (self = [super initWithFrame:frame]) {
           [self setup];
         }
         return self;
 }

 - (void)setup  {
       self.userInteractionEnabled = YES;
  }

  /**
   * 让label有资格成为第一响应者
   */
  - (BOOL)canBecomeFirstResponder  {
        return YES;
  }  

  /**
   * label能执行哪些操作(比如copy, paste等等)
   * @return  YES:支持这种操作
   */
   - (BOOL)canPerformAction:(SEL)action withSender:(id)sender  {
       return NO;
  }
      
  @end

• 在控制器当中

  #import "ViewController.h"
  #import "XJLabel.h"

  @interface ViewController ()
  @property (weak, nonatomic) IBOutlet XJLabel *label;
  @end

  @implementation ViewController

  - (void)viewDidLoad {
      [super viewDidLoad];  
      [self.label addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelClick)]];
    }

  - (void)labelClick  {
    // 1.label要成为第一响应者(作用是:告诉UIMenuController支持哪些操作, 这些操作如何处理)
      [self.label becomeFirstResponder];
    
    // 2.显示MenuController
    UIMenuController *menu = [UIMenuController sharedMenuController];
    
    // 添加MenuItem
    UIMenuItem *ding = [[UIMenuItem alloc] initWithTitle:@"顶" action:@selector(ding:)];
    UIMenuItem *replay = [[UIMenuItem alloc] initWithTitle:@"回复" action:@selector(replay:)];
    UIMenuItem *report = [[UIMenuItem alloc] initWithTitle:@"举报" action:@selector(report:)];
    menu.menuItems = @[ding, replay, report];
    
    [menu setTargetRect:self.label.bounds inView:self.label];
    [menu setMenuVisible:YES animated:YES];
  }

  - (void)ding:(UIMenuController *)menu  {
      NSLog(@"%s %@", __func__ , menu);
  }

  - (void)replay:(UIMenuController *)menu  {
      NSLog(@"%s %@", __func__ , menu);
  }

  - (void)report:(UIMenuController *)menu  {
      NSLog(@"%s %@", __func__ , menu);
  }

  @end

通过自定义UIMenuController,运行起来,就达到了需求要的效果,如图所示

Snip20161015_6.png

经过几天的奋战,终于完成了这个功能,记录下来供大家参考,如果喜欢,请关注我,我会随时更新文章,来一起成长......