// 非泛型函数,查找指定字符串在数组中的索引funcfindIndex(ofStringvalueToFind:String,inarray:[String])->Int?{for(index,value)inarray.enumerated(){ifvalue==valueToFind{// 找到返回索引值returnindex
//自定义标签栏代理协议 protocol MainTabBarDelegate { func didChooseItem(itemIndex:Int) } class MainTabBarView: UIView { var delegate:MainTabBarDelegate? //代理,点击item var itemArray:[MainTabBarItem] = [] //标签Item数组 init(frame: CGRect,tabbarConfigArr:[Dictionary<String,String>]) { supe...
Value>andElementinArray<Element>, which tells the reader about the relationship between the type parameter and the generic type or function it’s used in. However, when there isn’t a meaningful relationship between them, it’s traditional to name them using single letters such asT,U, and...
.image = pointIcon("plus.circle.fill")//Uncomment the following line to preserve selection between presentations//self.clearsSelectionOnViewWillAppear = false//Uncomment the following line to display an Edit button in the navigation bar for this view controller.//self.navigationItem.rightBarButtonIt...
指定push(_:) 方法有一个叫做 item 的形式参数,其必须是 Element 类型; 指定pop() 方法的返回值是一个 Element 类型的值。 因为它是泛型,因此能以 Array 和 Dictionary 相似的方式,用 Stack 创建一个Swift 中有效的任意类型的栈。 通过在尖括号中写出存储在栈里的类型,来创建一个新的 Stack 实例。例如,创...
NSString *filePath =NSHomeDirectory();-(NSArray *)jKGetAllFileNames:(NSString *)folderName { NSFileManager*fileManager =[NSFileManager defaultManager];//取得一个目录下得所有文件名NSArray *files =[fileManager subpathsAtPath:[self jKCreateFolder:folderName]];//NSLog(@"pdf名字的数量=%ld 数组...
// Swift 2funcfoo(x:NSArray) {// Invokes -description by magic AnyObject lookupprint(x[0].description) } will complain thatdescriptionis not a member ofAnyin Swift 3. You can convert the value withx[0] as AnyObjectto get the dynamic behavior back: ...
//数组的比较 var array1 = [1,2,3] var array2 = [1,2,3] if array1 == array2 { print("相等") }else{ print("不相等") } //遍历 var array3 = [1,2,3] for item in array3 { print(item)//每个数组中的元素的值 } for index in 0..<array3.count { print(array3[index])...
varitemImageView:itemImageViewType! {get} //创建TabBarItem内部UI元素 funcs(superView: UIView, position: CGRect, backgroundImage:UIImage?) //... } 其中,使用了关键字 associatedtype ,定义了一个关联类型;满足实际使用中,不同类型的TabBarItem中ImageView类型的变化,同时,又对其增加的限制,要求ImageView...
A function can take another function as one of its arguments. func hasAnyMatches(list: [Int], condition: (Int) -> Bool) -> Bool { for item in list { if condition(item) { return true } } return false } func lessThanTen(number: Int) -> Bool { return number < 10 } var numbers...