如何在自定义UIBarButtonItem上放置徽章

Question

我有一个带两个按钮的导航栏,一个是后退按钮,另一个是聊天符号.

我这样编写代码:

UIBarButtonItem *_btn=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"back.png"]
                                                      style:UIBarButtonItemStylePlain
                                                     target:self
                                                     action:@selector(goBackToPreviousView)];

self.navigationItem.leftBarButtonItem=_btn;
self.navigationItem.leftBarButtonItem.tintColor = [UIColor blackColor];


UIBarButtonItem *_btn2=[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"chat.png"]
                                                      style:UIBarButtonItemStylePlain
                                                     target:self
                                                     action:@selector(startChat)];

self.navigationItem.rightBarButtonItem=_btn2;
self.navigationItem.rightBarButtonItem.tintColor = [Utility colorWithHexValue:CyanBlue];

我遇到的问题是,只要聊天中有一些我没有看过的新消息,就应该有一些类型的徽章或聊天按钮上的自定义标签,以表明你有多少新消息.

我该怎么做呢？

Answer 1

对于Swift 3.0:

结果:

码:

override func viewDidLoad() {
  super.viewDidLoad()

  // badge label
  let label = UILabel(frame: CGRect(x: 10, y: -10, width: 20, height: 20))
  label.layer.borderColor = UIColor.clear.cgColor
  label.layer.borderWidth = 2
  label.layer.cornerRadius = label.bounds.size.height / 2
  label.textAlignment = .center
  label.layer.masksToBounds = true
  label.font = UIFont(name: "SanFranciscoText-Light", size: 13)
  label.textColor = .white
  label.backgroundColor = .red
  label.text = "80"

  // button
  let rightButton = UIButton(frame: CGRect(x: 0, y: 0, width: 18, height: 16))
  rightButton.setBackgroundImage(UIImage(named: "inbox"), for: .normal)
  rightButton.addTarget(self, action: #selector(rightButtonTouched), for: .touchUpInside)
  rightButton.addSubview(label)

  // Bar button item
  let rightBarButtomItem = UIBarButtonItem(customView: rightButton)

  navigationItem.rightBarButtonItem = rightBarButtomItem
}

func rightButtonTouched() {
  print("right button touched")
}

Answer 2

在iOS 8中 - 我可以通过更改badgeValue来实现

            self.messageButton.badgeValue = @"5";

消息按钮是UIBarButton

你必须将这两个文件包含在你的xcode UIBarButtonItem + Badge.h中.UIBarButtonItem + Badge.m

可以在这里找到

Github链接到文件

Answer 3

你可以试试这段代码：-

  UILabel *badgeLbl = [[UILabel alloc]initWithFrame:CGRectMake(16, -2, 18, 18)];
badgeLbl.backgroundColor = [UIColor whiteColor];
badgeLbl.textColor = [UIColor blackColor];
badgeLbl.textAlignment = NSTextAlignmentCenter;
badgeLbl.layer.cornerRadius = 9.0;
badgeLbl.layer.masksToBounds = true;
badgeLbl.text = @"10";

UIButton *notificationBtn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 35, 35)];
[notificationBtn setBackgroundImage:[UIImage imageNamed:@"image_name"] forState:UIControlStateNormal];
[notificationBtn setTitle:@"" forState:UIControlStateNormal];
[notificationBtn addTarget:self action:@selector(onClickAction:) forControlEvents:UIControlEventTouchUpInside];

[notificationBtn addSubview:badgeLbl];

UIBarButtonItem *notificationBarBtn = [[UIBarButtonItem alloc]initWithCustomView:notificationBtn];
self.navigationItem.rightBarButtonItem = notificationBarBtn;

Answer 4

尝试这个自定义控件- mknumberbadgeview