我正在设置一个图像为酒吧按钮项目,我有一个像:
分辨率为30 * 30,但是我将此图像分配给条形按钮,其外观如下所示:
我以这种方式分配了图像:
并且如果我尝试这样的方式像制作一个IBOutlet的按钮,并设置图像编程从this问题和代码为:
- // Outlet for bar button
- @IBOutlet weak var fbButton: UIBarButtonItem!
- // Set Image for bar button
- var backImg: UIImage = UIImage(named: "fb.png")!
- fbButton.setBackgroundImage(backImg,forState: .Normal,barMetrics: .Default)
但没有发生这个,
有人可以告诉我我做错了什么吗?
或者是这样做的糊口?
我已经通过以下代码实现了这一点:
- import UIKit
- class ViewController: UIViewController {
- override func viewDidLoad() {
- super.viewDidLoad()
- //create a new button
- let button: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as! UIButton
- //set image for button
- button.setImage(UIImage(named: "fb.png"),forState: UIControlState.Normal)
- //add function for button
- button.addTarget(self,action: "fbButtonPressed",forControlEvents: UIControlEvents.TouchUpInside)
- //set frame
- button.frame = CGRectMake(0,53,31)
- let barButton = UIBarButtonItem(customView: button)
- //assign button to navigationbar
- self.navigationItem.rightBarButtonItem = barButton
- }
- //This method will call when you press button.
- func fbButtonPressed() {
- println("Share to fb")
- }
- }
结果将是:
同样的方式,您也可以通过这种方式设置左侧的按钮:
- self.navigationItem.leftBarButtonItem = barButton
结果将是:
如果您想要与导航控制器相同的事务,当您返回使用默认返回按钮,那么您可以使用此代码使用自定义后退按钮实现:
- func backButtonPressed(sender:UIButton) {
- navigationController?.popViewControllerAnimated(true)
- }
对于swift 3.0:
- import UIKit
- class ViewController: UIViewController {
- override func viewDidLoad() {
- super.viewDidLoad()
- //create a new button
- let button = UIButton.init(type: .custom)
- //set image for button
- button.setImage(UIImage(named: "fb.png"),for: UIControlState.normal)
- //add function for button
- button.addTarget(self,action: #selector(ViewController.fbButtonPressed),for: UIControlEvents.touchUpInside)
- //set frame
- button.frame = CGRect(x: 0,y: 0,width: 53,height: 51)
- let barButton = UIBarButtonItem(customView: button)
- //assign button to navigationbar
- self.navigationItem.rightBarButtonItem = barButton
- }
- //This method will call when you press button.
- func fbButtonPressed() {
- print("Share to fb")
- }
- }