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1. 用十六进制初始化UIColor()
extension UIColor {
func colorFrom(hex hex: Int) -> UIColor {
let r = (hex & 0xff0000) >> 16
let g = (hex & 0x00ff00) >> 8
let b = hex & 0x0000ff
return UIColor(red: CGFloat(r)/255, green: CGFloat(g)/255, blue: CGFloat(b)/255, alpha: 1)
}
}
调用：
let redColor = UIColor().colorFrom(hex: 0x123123)
2. NavigationBar 设置
具体参数解释参考另一篇文章
func setNavigationControllerBar(navigationController: UINavigationController, barColor: UIColor, title: String, titleColor: UIColor = UIColor.whiteColor(), titleAttributes: [String: AnyObject] = [:]) {
navigationController.navigationBar.barStyle = barStyle
navigationController.navigationBar.translucent = translcent // 注意会导致背景颜色变化， 详见解释
navigationController.navigationBar.barTintColor = barColor
navigationController.navigationBar.tintColor = titleColor
navigationItem.title = title
navigationController.navigationBar.titleTextAttributes = titleAttributes
if navigationController.navigationBar.titleTextAttributes![NSForegroundColorAttributeName] == nil { // 逻辑判断什么小伙伴自己看看 不需要的就直接删除掉，就是在设置文字颜色的时候看看标题颜色是不是设置成了别的颜色
navigationController.navigationBar.titleTextAttributes![NSForegroundColorAttributeName] = titleColor
}
}
调用:
override func viewDidLoad() {
super.viewDidLoad()
setNavigationControllerBar(self.navigationController!, barColor: UIColor.redColor(), title: "MainView",titleAttributes: [NSForegroundColorAttributeName: UIColor.purpleColor(), NSFontAttributeName: UIFont(name: "Times new roman", size: 20)!])
setBackButtonItem(self.navigationItem, title: "Back")
}
3. 导航栏返回按钮设置
func setBackButtonItem(navgationItem: UINavigationItem, title: String) {
let backButton = UIBarButtonItem(title: title, style: .Plain, target: nil, action: nil)
navigationItem.backBarButtonItem = backButton
}
调用:
override func viewDidLoad() {
super.viewDidLoad()
setNavigationControllerBar(self.navigationController!, barColor: UIColor.redColor(), title: "MainView",titleAttributes: [NSForegroundColorAttributeName: UIColor.purpleColor(), NSFontAttributeName: UIFont(name: "Times new roman", size: 20)!])
setBackButtonItem(self.navigationItem, title: "Back")
}
4. 网络图片
func getImage(fromURl url: URL) -> UIImage? {
do {
let imageData = try Data(contentsOf: url)
return UIImage(data: imageData)
}
catch {
print(error.localizedDescription)
return nil
}
}
// image.sd_setImage(with: url, placeholderImage: UIImage(named: "placeHolder")) SDWebImageView