我认为采用一个小的Obj-C库并将其转换为
Swift是一个很好的学习实验.由于我最终想在应用程序中使用此库,因此我在此处找到了Path app菜单示例：
https://github.com/yourabi/PathMenuExample
我认为我已经做好了转换和搜索答案的工作,因为我刚刚开始使用Obj-C和Swift.但现在我遇到了一个我无法找到解决方案的错误.
ExpandableNavigation.swift
import Foundation
import UIKit;
class ExpandableNavigation: NSObject {
var mainButton: UIButton;
var menuItems: NSArray;
var radius: CGFloat;
var speed: CGFloat;
var bounce: CGFloat;
var bounceSpeed: CGFloat;
var expanded: Bool;
var transition: Bool;
init(menuItems: NSArray,mainButton: UIButton,radius: CGFloat) {
self.menuItems = menuItems;
self.mainButton = mainButton;
self.radius = radius;
self.speed = 0.15;
self.bounce = 0.225;
self.bounceSpeed = 0.1;
expanded = false;
transition = false;
super.init()
if self.mainButton != nil {
for view: UIView in self.menuItems {
view.center = self.mainButton.center;
}
self.mainButton.addTarget(self,action:"press",forControlEvents: UIControlEvents.TouchUpInside);
}
}
func expand() -> Void {
transition = true;
UIView.animateWithDuration(0.15,animations: {
self.mainButton.transform = CGAffineTransformMakeRotation(45.0 * M_PI/180)
})
for view: UIView in self.menuItems {
var index: Int? = findIndex(self.menuItems,valueToFind: view);
var oneOverCount: Float;
if self.menuItems.count <= 1 {
oneOverCount = 1.0;
} else {
oneOverCount = (1.0 / Float(self.menuItems.count - 1));
}
var indexOverCount: CGFloat = CGFloat(index!) * CGFloat(oneOverCount);
var rad: CGFloat = (1.0 - CGFloat(indexOverCount)) * 90.0 * CGFloat(M_PI) / 180.0;
var rotation: CGAffineTransform = CGAffineTransformMakeRotation(rad);
var x: CGFloat = (self.radius + self.bounce * self.radius) * rotation.a;
var y: CGFloat = (self.radius + self.bounce * self.radius) * rotation.c;
var center: CGPoint = CGPointMake(view.center.x + x,view.center.y + y);
UIView.animateWithDuration(self.speed,delay: self.speed * indexOverCount,options: UIViewAnimationOptions.CurveEaseIn,animations: {
view.center = center;
},completion: {(finished: Bool) in
UIView.animateWithDuration(self.bounceSpeed,animations: {
var x: CGFloat = self.bounce * self.radius * rotation.a;
var y: CGFloat = self.bounce * self.radius * rotation.c;
var center: CGPoint = CGPointMake(view.center.x + x,view.center.y + y);
view.center = center;
});
if view == (self.menuItems.endIndex - 1) {
self.expanded = true;
self.transition = false;
}
})
}
}
func collapse() -> Void {
transition = true;
}
@IBAction func press(sender: AnyObject) {
if !self.transition {
if !self.expanded {
self.expand();
} else {
self.collapse();
}
}
}
func findIndex<T: Equatable>(array: T[],valueToFind: T) -> Int? {
for (index,value) in enumerate(array) {
if value == valueToFind {
return index
}
}
return nil
}
}
ExpandableNavigation.swift出错
错误：类型注释与上下文类型“AnyObject”不匹配
在init()和expand()方法中都会出现此错误
for view：UIView in self.menuItems {
我尝试制作数组UIView [],但这导致其他错误.
ViewController.swift – 供参考
class ViewController: UIViewController {
@IBOutlet var expandNavMainButton: UIButton;
@IBOutlet var expandNavCheckInButton: UIButton;
@IBOutlet var expandNavReviewButton: UIButton;
@IBOutlet var expandNavPhotoButton: UIButton;
@IBOutlet var expandNavStatusButton: UIButton;
var expandableNavigation: ExpandableNavigation;
init(coder aDecoder: NSCoder!) {
var buttons: NSArray = [expandNavCheckInButton,expandNavReviewButton,expandNavPhotoButton,expandNavStatusButton];
var myRadius: CGFloat = 120.0
self.expandableNavigation = ExpandableNavigation(menuItems: buttons,mainButton: self.expandNavMainButton,radius: myRadius);
super.init(coder: aDecoder)
}
为了安全起见,Swift不会为你进行任何隐式的施法.它不会在没有显式强制转换的情况下将AnyObject(NSArray存储的类型)强制转换为UIView.您应该执行以下操作：
for obj : AnyObject in menuItems {
if let view = obj as? UIView {
view.center = self.mainButton.center;
}
}
这将使用AnyObject循环遍历菜单项数组,并在将obj作为一个视图投射之前检查obj是否为视图.
