这是我的 Objective-C 代码，我用它来为我的自定义 UIView 加载一个 nib：
-(id)init{
NSArray *subviewArray = [[NSBundle mainBundle] loadNibNamed:@"myXib" owner:self options:nil];
return [subviewArray objectAtIndex:0];
}
Swift 中的等价代码是什么？
【问题讨论】：
如果您的项目中有很多自定义视图，您可以创建像 UIViewFromNib 这样的类
斯威夫特 2.3
class UIViewFromNib: UIView {
var contentView: UIView!
var nibName: String {
return String(self.dynamicType)
}
//MARK:
override init(frame: CGRect) {
super.init(frame: frame)
loadViewFromNib()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
loadViewFromNib()
}
//MARK:
private func loadViewFromNib() {
contentView = NSBundle.mainBundle().loadNibNamed(nibName, owner: self, options: nil)[0] as! UIView
contentView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
contentView.frame = bounds
addSubview(contentView)
}
}
斯威夫特 5
class UIViewFromNib: UIView {
var contentView: UIView!
var nibName: String {
return String(describing: type(of: self))
}
//MARK:
override init(frame: CGRect) {
super.init(frame: frame)
loadViewFromNib()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
loadViewFromNib()
}
//MARK:
func loadViewFromNib() {
let bundle = Bundle(for: UIViewFromNib.self)
contentView = UINib(nibName: nibName, bundle: bundle).instantiate(withOwner: self).first as? UIView
contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
contentView.frame = bounds
addSubview(contentView)
}
}
并且在每个类中都继承自UIViewFromNib，如果.xib 文件具有不同的名称，您也可以覆盖nibName 属性：
class MyCustomClass: UIViewFromNib {
}
【讨论】：
Swift 5
在下面的某个地方定义：
extension UIView {
public class func fromNib<T: UIView>() -> T {
let name = String(describing: Self.self);
guard let nib = Bundle(for: Self.self).loadNibNamed(
name, owner: nil, options: nil)
else {
fatalError("Missing nib-file named: \(name)")
}
return nib.first as! T
}
}
并像上面一样使用：
let view = MyCustomView.fromNib();
它将在与
MyCustomView相同的包中搜索，然后加载MyCustomView.nib文件（如果文件存在，并添加到项目中）。
【讨论】：
// 使用这个类作为超级视图
import UIKit
class ViewWithXib: UIView {
func initUI() {}
private func xibSetup() {
let view = loadViewFromNib()
view.frame = bounds
view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]
addSubview(view)
initUI()
}
private func loadViewFromNib() -> UIView {
let thisName = String(describing: type(of: self))
let view = Bundle(for: self.classForCoder).loadNibNamed(thisName, owner: self, options: nil)?.first as! UIView
return view
}
override init(frame: CGRect) {
super.init(frame: frame)
xibSetup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
xibSetup()
}
}
// 用法：
class HeaderView: ViewWithXib {
}
let header = HeaderView() // No need to load the view from nib, It will work
【讨论】：
我就是这样做的：
if let myView = UINib.init(nibName: "MyView", bundle: nil).instantiate(withOwner: self)[0] as? MyView {
// Do something with myView
}
此示例使用主包中 nib“MyView.xib”中的第一个视图。但是您可以更改索引、笔尖名称或捆绑包（默认为 main ）。
我曾经将视图唤醒到视图 init 方法中，或者像上面建议的答案那样制作通用方法（顺便说一句，这很聪明），但我不再这样做了，因为我注意到用例通常不同，为了涵盖所有情况，泛型方法变得与使用 UINib.instantiate 方法一样复杂。
我更喜欢使用工厂对象，通常是使用视图的 ViewController，如果需要在多个地方使用视图，我更喜欢使用专用工厂对象或视图扩展。
在本例中，ViewController 从 nib 加载视图。 可以更改 nib 文件以对同一视图类使用不同的布局。 （这不是很好的代码，它只是说明了这个想法）
class MyViewController {
// Use "MyView-Compact" for compact version
var myViewNibFileName = "MyView-Standard"
lazy var myView: MyView = {
// Be sure the Nib is correct, or it will crash
// We don't want to continue with a wrong view anyway, so ! is ok
UINib.init(nibName: myViewNibFileName, bundle: nil).instantiate(withOwner: self)[0] as! MyView
}()
}
【讨论】：
//
// Refactored by Essam Mohamed Fahmi.
//
import UIKit
extension UIView
{
static var nib: UINib
{
return UINib(nibName: "\(self)", bundle: nil)
}
static func instantiateFromNib() -> Self?
{
return nib.instantiate() as? Self
}
}
extension UINib
{
func instantiate() -> Any?
{
return instantiate(withOwner: nil, options: nil).first
}
}
let myCustomView: CustomView = .instantiateFromNib()
【讨论】：
Swift 4 - 5.1 协议扩展
public protocol NibInstantiatable {
static func nibName() -> String
}
extension NibInstantiatable {
static func nibName() -> String {
return String(describing: self)
}
}
extension NibInstantiatable where Self: UIView {
static func fromNib() -> Self {
let bundle = Bundle(for: self)
let nib = bundle.loadNibNamed(nibName(), owner: self, options: nil)
return nib!.first as! Self
}
}
采用
class MyView: UIView, NibInstantiatable {
}
此实现假定 Nib 与 UIView 类同名。前任。我的视图.xib。您可以通过在 MyView 中实现 nibName() 来修改此行为，以返回与默认协议扩展实现不同的名称。
在 xib 中，文件所有者是 MyView，根视图类是 MyView。
用法
let view = MyView.fromNib()
【讨论】：
现在能够快速返回-> Self 有助于简化这一点。最后在 Swift 5 上确认。
extension UIView {
class func fromNib(named: String? = nil) -> Self {
let name = named ?? "\(Self.self)"
guard
let nib = Bundle.main.loadNibNamed(name, owner: nil, options: nil)
else { fatalError("missing expected nib named: \(name)") }
guard
/// we're using `first` here because compact map chokes compiler on
/// optimized release, so you can't use two views in one nib if you wanted to
/// and are now looking at this
let view = nib.first as? Self
else { fatalError("view of type \(Self.self) not found in \(nib)") }
return view
}
}
如果您的.xib 文件和子类共享相同的名称，您可以使用：
let view = CustomView.fromNib()
如果您有自定义名称，请使用：
let view = CustomView.fromNib(named: "special-case")
注意：
如果您收到错误“在..中找不到 YourType 类型的视图”，那么您还没有在 .xib 文件中设置视图的类
在.xib 文件中选择您的视图，然后按cmd + opt + 4 并在class 输入中输入您的班级
【讨论】：
let myCustomView = UIView.fromNib() as? CustomView，我仍然有问题。在这种情况下，T.self 解析为UIView 而不是CustomView，它无法找到笔尖。我不知道为什么会这样 - 也许let 的推断类型意味着该函数被称为UIView？
let nibs = Bundle.main.loadNibNamed("YourView", owner: nil, options: nil)
let shareView = nibs![0] as! ShareView
self.view.addSubview(shareView)
【讨论】：
我更喜欢下面的扩展
extension UIView {
class var instanceFromNib: Self {
return Bundle(for: Self.self)
.loadNibNamed(String(describing: Self.self), owner: nil, options: nil)?.first as! Self
}
}
此扩展名与回答最多的扩展名之间的区别在于您不需要将其存储为常量或变量。
class TitleView: UIView { }
extension UIView {
class var instanceFromNib: Self {
return Bundle(for: Self.self)
.loadNibNamed(String(describing: Self.self), owner: nil, options: nil)?.first as! Self
}
}
self.navigationItem.titleView = TitleView.instanceFromNib
【讨论】：
let bundle = Bundle(for: type(of: self))
let views = bundle.loadNibNamed("template", owner: self, options: nil)
self.view.addSubview(views?[0] as! UIView)
【讨论】：
我的贡献：
extension UIView {
class func fromNib<T: UIView>() -> T {
return Bundle(for: T.self).loadNibNamed(String(describing: T.self), owner: nil, options: nil)![0] as! T
}
}
然后这样称呼它：
let myCustomView: CustomView = UIView.fromNib()
..甚至：
let myCustomView: CustomView = .fromNib()
【讨论】：
使用 Swift 实现此目的的一个好方法是使用枚举。
enum Views: String {
case view1 = "View1" // Change View1 to be the name of your nib
case view2 = "View2" // Change View2 to be the name of another nib
func getView() -> UIView? {
return NSBundle.mainBundle().loadNibNamed(self.rawValue, owner: nil, options: nil).first as? UIView
}
}
然后在您的代码中您可以简单地使用：
let view = Views.view1.getView()
【讨论】：
原始解决方案
.
class SomeView: UIView {
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
NSBundle.mainBundle().loadNibNamed("SomeView", owner: self, options: nil)
self.addSubview(self.view); // adding the top level view to the view hierarchy
}
...
}
请注意，这样我得到了一个从 nib 加载自身的类。然后，只要可以在项目中使用 UIView（在界面构建器中或以编程方式），我就可以使用 SomeView 作为类。
更新 - 使用 Swift 3 语法
在下面的扩展中加载一个 xib 被写成一个实例方法，然后可以被上面的初始化器使用：
extension UIView {
@discardableResult // 1
func fromNib<T : UIView>() -> T? { // 2
guard let contentView = Bundle(for: type(of: self)).loadNibNamed(String(describing: type(of: self)), owner: self, options: nil)?.first as? T else { // 3
// xib not loaded, or its top view is of the wrong type
return nil
}
self.addSubview(contentView) // 4
contentView.translatesAutoresizingMaskIntoConstraints = false // 5
contentView.layoutAttachAll(to: self) // 6
return contentView // 7
}
}
调用者方法可能如下所示：
final class SomeView: UIView { // 1.
required init?(coder aDecoder: NSCoder) { // 2 - storyboard initializer
super.init(coder: aDecoder)
fromNib() // 5.
}
init() { // 3 - programmatic initializer
super.init(frame: CGRect.zero) // 4.
fromNib() // 6.
}
// other methods ...
}
Credit：在此解决方案中使用通用扩展的灵感来自 Robert 在下面的回答。
编辑 将“view”更改为“contentView”以避免混淆。还将数组下标更改为“.first”。
【讨论】：
File's Owner 恰到好处...谢谢！
init(coder aDecoder: NSCoder) 内部调用fromNib() 会创建一个无限循环，因为在fromNib() 方法中加载Nib 会调用：init(coder aDecoder: NSCoder)
这是一种使用协议和协议扩展 (Swift 4.2) 以编程方式加载视图的干净且声明性的方式：
protocol XibLoadable {
associatedtype CustomViewType
static func loadFromXib() -> CustomViewType
}
extension XibLoadable where Self: UIView {
static func loadFromXib() -> Self {
let nib = UINib(nibName: "\(self)", bundle: Bundle(for: self))
guard let customView = nib.instantiate(withOwner: self, options: nil).first as? Self else {
// your app should crash if the xib doesn't exist
preconditionFailure("Couldn't load xib for view: \(self)")
}
return customView
}
}
你可以这样使用：
// don't forget you need a xib file too
final class MyView: UIView, XibLoadable { ... }
// and when you want to use it
let viewInstance = MyView.loadFromXib()
一些额外的注意事项：
Custom Class（以及从那里设置的 outlet/actions），而不是文件所有者的。【讨论】：
斯威夫特 4
别忘了写“.first as?CustomView”。
if let customView = Bundle.main.loadNibNamed("myXib", owner: self, options: nil)?.first as? CustomView {
self.view.addSubview(customView)
}
如果你想在任何地方使用
最佳解决方案是 Robert Gummesson 的答案。
extension UIView {
class func fromNib<T: UIView>() -> T {
return Bundle.main.loadNibNamed(String(describing: T.self), owner: nil, options: nil)![0] as! T
}
}
然后这样称呼它：
let myCustomView: CustomView = UIView.fromNib()
【讨论】：
class func loadFromNib<T: UIView>() -> T {
let nibName = String(describing: self)
return Bundle.main.loadNibNamed(nibName, owner: nil, options: nil)![0] as! T
}
【讨论】：
如果您希望 Swift UIView 子类完全自包含，并且能够使用 init 或 init(frame:) 实例化而不暴露使用 Nib 的实现细节，那么您可以使用协议扩展来实现这。此解决方案避免了许多其他解决方案所建议的嵌套 UIView 层次结构。
public class CustomView: UIView {
@IBOutlet weak var nameLabel: UILabel!
@IBOutlet weak var valueLabel: UILabel!
public convenience init() {
self.init(frame: CGRect.zero)
}
public override convenience init(frame: CGRect) {
self.init(internal: nil)
self.frame = frame
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commonInit()
}
fileprivate func commonInit() {
}
}
fileprivate protocol _CustomView {
}
extension CustomView: _CustomView {
}
fileprivate extension _CustomView {
// Protocol extension initializer - has the ability to assign to self, unlike
// class initializers. Note that the name of this initializer can be anything
// you like, here we've called it init(internal:)
init(internal: Int?) {
self = Bundle.main.loadNibNamed("CustomView", owner:nil, options:nil)![0] as! Self;
}
}
【讨论】：
init(coder:) 将在链的下游被调用，这将期望所述属性已经设置或在返回之前自行设置它们到基于协议的初始化。
最方便的实现。这里需要两个方法，直接返回你类的对象，而不是UIView。
extension UIView {
class var viewId: String {
return String(describing: self)
}
static func instance(from bundle: Bundle? = nil, nibName: String? = nil,
owner: Any? = nil, options: [AnyHashable : Any]? = nil) -> Self? {
return instancePrivate(from: bundle ?? Bundle.main,
nibName: nibName ?? viewId,
owner: owner,
options: options)
}
private static func instancePrivate<T: UIView>(from bundle: Bundle, nibName: String,
owner: Any?, options: [AnyHashable : Any]?) -> T? {
guard
let views = bundle.loadNibNamed(nibName, owner: owner, options: options),
let view = views.first(where: { $0 is T }) as? T else { return nil }
return view
}
}
例子：
guard let customView = CustomView.instance() else { return }
//Here customView has CustomView class type, not UIView.
print(customView is CustomView) // true
【讨论】：
您可以通过情节提要执行此操作，只需为视图添加适当的约束。您可以通过继承您自己的任何视图轻松地做到这一点，比如说BaseView：
Objective-C
BaseView.h
/*!
@class BaseView
@discussion Base View for getting view from xibFile
@availability ios7 and later
*/
@interface BaseView : UIView
@end
BaseView.m
#import "BaseView.h"
@implementation BaseView
#pragma mark - Public
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self prepareView];
}
return self;
}
#pragma mark - LifeCycle
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self prepareView];
}
return self;
}
#pragma mark - Private
- (void)prepareView
{
NSArray *nibsArray = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:self options:nil];
UIView *view = [nibsArray firstObject];
view.translatesAutoresizingMaskIntoConstraints = NO;
[self addSubview:view];
[self addConstraintsForView:view];
}
#pragma mark - Add constraints
- (void)addConstraintsForView:(UIView *)view
{
[self addConstraints:@[[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual
toItem:self attribute:NSLayoutAttributeBottom
multiplier:1.0
constant:0],
[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self attribute:NSLayoutAttributeTop
multiplier:1.0
constant:0],
[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:self attribute:NSLayoutAttributeLeft
multiplier:1.0
constant:0],
[NSLayoutConstraint constraintWithItem:view
attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual
toItem:self attribute:NSLayoutAttributeRight
multiplier:1.0
constant:0]
]];
}
@end
斯威夫特 4
import UIKit
class BaseView : UIView {
// MARK: - LifeCycle
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
prepareView()
}
override init(frame: CGRect) {
super.init(frame: frame)
prepareView()
}
internal class func xibName() -> String {
return String(describing: self)
}
// MARK: - Private
fileprivate func prepareView() {
let nameForXib = BaseView.xibName()
let nibs = Bundle.main.loadNibNamed(nameForXib, owner: self, options: nil)
if let view = nibs?.first as? UIView {
view.backgroundColor = UIColor.clear
view.translatesAutoresizingMaskIntoConstraints = false
addSubviewWithConstraints(view, offset: false)
}
}
}
UIView+Subview
public extension UIView {
// MARK: - UIView+Extensions
public func addSubviewWithConstraints(_ subview:UIView, offset:Bool = true) {
subview.translatesAutoresizingMaskIntoConstraints = false
let views = [
"subview" : subview
]
addSubview(subview)
var constraints = NSLayoutConstraint.constraints(withVisualFormat: offset ? "H:|-[subview]-|" : "H:|[subview]|", options: [.alignAllLeading, .alignAllTrailing], metrics: nil, views: views)
constraints.append(contentsOf: NSLayoutConstraint.constraints(withVisualFormat: offset ? "V:|-[subview]-|" : "V:|[subview]|", options: [.alignAllTop, .alignAllBottom], metrics: nil, views: views))
NSLayoutConstraint.activate(constraints)
}
}
我提供了 2 个变体如何添加约束 - 常见的一个和在视觉格式语言中 - 选择任何你想要的 :)
此外，默认情况下假定xib 名称与实现类名称具有相同的名称。如果没有 - 只需更改 xibName 参数。
如果您从 BaseView 继承您的视图 - 您可以轻松地在 IB 中放置任何视图并指定类。
【讨论】：
基于洛根回答的更强大的版本
extension UIView {
public class func fromNib(nibName: String? = nil) -> Self {
return fromNib(nibName: nibName, type: self)
}
public class func fromNib<T: UIView>(nibName: String? = nil, type: T.Type) -> T {
return fromNib(nibName: nibName, type: T.self)!
}
public class func fromNib<T: UIView>(nibName: String? = nil, type: T.Type) -> T? {
var view: T?
let name: String
if let nibName = nibName {
name = nibName
} else {
name = self.nibName
}
if let nibViews = nibBundle.loadNibNamed(name, owner: nil, options: nil) {
if nibViews.indices.contains(nibIndex), let tog = nibViews[nibIndex] as? T {
view = tog
}
}
return view
}
public class var nibName: String {
return "\(self)".components(separatedBy: ".").first ?? ""
}
public class var nibIndex: Int {
return 0
}
public class var nibBundle: Bundle {
return Bundle.main
}
}
你可以像这样使用
class BaseView: UIView {
override class var nibName: String { return "BaseView" }
weak var delegate: StandardStateViewDelegate?
}
class ChildView: BaseView {
override class var nibIndex: Int { return 1 }
}
【讨论】：
您所要做的就是在 UIView 类中调用 init 方法。
这样做：
class className: UIView {
@IBOutlet var view: UIView!
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
}
func setup() {
UINib(nibName: "nib", bundle: nil).instantiateWithOwner(self, options: nil)
addSubview(view)
view.frame = self.bounds
}
}
现在，如果您想将此视图添加为视图控制器中的子视图，请在视图控制器.swift 文件中这样做：
self.view.addSubview(className())
【讨论】：
以上述解决方案为基础。
这将适用于所有项目包，并且在调用 fromNib() 时不需要泛型。
斯威夫特 2
extension UIView {
public class func fromNib() -> Self {
return fromNib(nil)
}
public class func fromNib(nibName: String?) -> Self {
func fromNibHelper<T where T : UIView>(nibName: String?) -> T {
let bundle = NSBundle(forClass: T.self)
let name = nibName ?? String(T.self)
return bundle.loadNibNamed(name, owner: nil, options: nil)?.first as? T ?? T()
}
return fromNibHelper(nibName)
}
}
斯威夫特 3
extension UIView {
public class func fromNib() -> Self {
return fromNib(nibName: nil)
}
public class func fromNib(nibName: String?) -> Self {
func fromNibHelper<T>(nibName: String?) -> T where T : UIView {
let bundle = Bundle(for: T.self)
let name = nibName ?? String(describing: T.self)
return bundle.loadNibNamed(name, owner: nil, options: nil)?.first as? T ?? T()
}
return fromNibHelper(nibName: nibName)
}
}
可以这样使用：
let someView = SomeView.fromNib()
或者像这样：
let someView = SomeView.fromNib("SomeOtherNibFileName")
【讨论】：
Swift 3 版本的 Logan 的回答
extension UIView {
public class func fromNib(nibName: String? = nil) -> Self {
return fromNib(nibName: nibName, type: self)
}
public class func fromNib<T: UIView>(nibName: String? = nil, type: T.Type) -> T {
return fromNib(nibName: nibName, type: T.self)!
}
public class func fromNib<T: UIView>(nibName: String? = nil, type: T.Type) -> T? {
var view: T?
let name: String
if let nibName = nibName {
name = nibName
} else {
name = self.nibName
}
if let nibViews = Bundle.main.loadNibNamed(name, owner: nil, options: nil) {
for nibView in nibViews {
if let tog = nibView as? T {
view = tog
}
}
}
return view
}
public class var nibName: String {
return "\(self)".components(separatedBy: ".").first ?? ""
}
public class var nib: UINib? {
if let _ = Bundle.main.path(forResource: nibName, ofType: "nib") {
return UINib(nibName: nibName, bundle: nil)
} else {
return nil
}
}
}
【讨论】：
与上面的一些答案类似，但更一致的 Swift3 UIView 扩展：
extension UIView {
class func fromNib<A: UIView> (nibName name: String, bundle: Bundle? = nil) -> A? {
let bundle = bundle ?? Bundle.main
let nibViews = bundle.loadNibNamed(name, owner: self, options: nil)
return nibViews?.first as? A
}
class func fromNib<T: UIView>() -> T? {
return fromNib(nibName: String(describing: T.self), bundle: nil)
}
}
这为能够从自命名的 nib 以及其他 nib/bundle 加载类提供了便利。
【讨论】：
在 Xcode 7 beta 4、Swift 2.0 和 iOS9 SDK 中测试。 下面的代码会将 xib 分配给 uiview。 您可以在故事板中使用此自定义 xib 视图并访问 IBOutlet 对象。
import UIKit
@IBDesignable class SimpleCustomView:UIView
{
var view:UIView!;
@IBOutlet weak var lblTitle: UILabel!
@IBInspectable var lblTitleText : String?
{
get{
return lblTitle.text;
}
set(lblTitleText)
{
lblTitle.text = lblTitleText!;
}
}
override init(frame: CGRect) {
super.init(frame: frame)
loadViewFromNib ()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
loadViewFromNib ()
}
func loadViewFromNib() {
let bundle = NSBundle(forClass: self.dynamicType)
let nib = UINib(nibName: "SimpleCustomView", bundle: bundle)
let view = nib.instantiateWithOwner(self, options: nil)[0] as! UIView
view.frame = bounds
view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
self.addSubview(view);
}
}
以编程方式访问自定义视图
self.customView = SimpleCustomView(frame: CGRectMake(100, 100, 200, 200))
self.view.addSubview(self.customView!);
【讨论】：
我通过以下代码使用 Swift 实现了这一点：
class Dialog: UIView {
@IBOutlet var view:UIView!
override init(frame: CGRect) {
super.init(frame: frame)
self.frame = UIScreen.mainScreen().bounds
NSBundle.mainBundle().loadNibNamed("Dialog", owner: self, options: nil)
self.view.frame = UIScreen.mainScreen().bounds
self.addSubview(self.view)
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
}
不要忘记将您的 XIB view 插座连接到 swift 中定义的 view 插座。您还可以将 First Responder 设置为您的自定义类名称以开始连接任何其他插座。
希望这会有所帮助！
【讨论】：
我更喜欢这个解决方案（基于@GK100的答案）：
在 SomeView.swift 中，我在 init 或 init:frame: CGRect 初始化程序中加载了 XIB。没有必要为“自我”分配任何东西。加载 XIB 后，所有插座都已连接，包括顶层视图。唯一缺少的是将顶视图添加到视图层次结构中：
class SomeView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
NSBundle.mainBundle().loadNibNamed("SomeObject", owner: self, options: nil)
self.addSubview(self.view); // adding the top level view to the view hierarchy
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
NSBundle.mainBundle().loadNibNamed("SomeObject", owner: self, options: nil)
self.addSubview(self.view); // adding the top level view to the view hierarchy
}
...
}
【讨论】：
试试下面的代码。
var uiview :UIView?
self.uiview = NSBundle.mainBundle().loadNibNamed("myXib", owner: self, options: nil)[0] as? UIView
编辑：
import UIKit
class TestObject: NSObject {
var uiview:UIView?
init() {
super.init()
self.uiview = NSBundle.mainBundle().loadNibNamed("myXib", owner: self, options: nil)[0] as? UIView
}
}
【讨论】：
let subviewArray = NSBundle.mainBundle().loadNibNamed("myXib", owner: self, options: nil)
return subviewArray[0]
【讨论】：
self 从所有 init 方法中隐式返回...