type cast operator in aniforguardstatement to extract a value of known type as a constant. To get aDictionaryvalue from a JSON object type, conditionally cast it as[String: Any]. To get anArrayvalue from a JSON
As I mentioned in Chapter 1, Swift object types come in three flavors: enum, struct, and class. What are the differences between them? And how would you create your own object type? That’s what this chapter is about. I’ll describe object types in general, and then each of the ...
This means that when you make a copy of something with that type, you know it won’t be modified elsewhere. Another safety feature is that by default Swift objects can never be nil. In fact, the Swift compiler will stop you from trying to make or use a nil object with a compile-...
在Swift与OC混编场景，编译器会根据OC标识符将OC的对象类型转换成Swift类型，如果没有显式的标识，默认是null_unspecified。例如：@interface ExampleOCClass : NSObject// 没有指定标识符，且没有被NS_ASSUME_NONNULL_BEGIN和NS_ASSUME_NONNULL_END包裹，标识符默认为null_unspecified+ (ExampleOCClass *)getExampleO...
request.setValue("application/json", forHTTPHeaderField: "Content-Type")// 将数据转换为JSON格式 do { let jsonData = try JSONSerialization.data(withJSONObject: data, options: [])request.httpBody = jsonData } catch { print("Error converting data to JSON: \(error)")return // 发送请求 let...
在Swift中,可以通过将字典作为参数发送到GET请求。下面是一个示例代码,展示了如何将字典作为参数发送到GET请求: 代码语言:txt 复制 // 导入必要的库 import Foundation // 定义一个函数来发送GET请求并将字典作为参数传递 func sendGETRequest(withParameters parameters: [String: Any]) { // 创建URL对象 var url...
{wrappValue}inti(){ifletvalue=Environment.shared.values.first(where:{$0isObjectiveType})as?ObjectiveType{self.wrappVlaue=value}else{//如果找不到属性所对应的值 抛出异常fatalError("MissingType in envrionment")}}}//最后代理协议还需要一个全局变量的修饰protocolAnyGlobal{varanyWrappedValue:Any{get}...
objc_getClassList(autoreleasingTypes, Int32(typeCount)) for index in 0 ..< typeCount { (types[index] as? SelfAware.Type)?.awake() } types.deallocate() } } 2.实现 占位图协议 //占位图的协议 @objc protocol PlaceHolderTableViewDelegate :class { ...
enum CustomType { case name(String) case num(Int) } 减少var属性 使用计算属性 使用计算属性可以减少多个变量同步带来的潜在 bug。 不推荐 class model { var data: Object? var loaded: Bool } model.data = Object() loaded = false 推荐
简介:Swift - 原生GET&POST请求的用法 只要属于移动开发的范畴,网络请求一定是其中的重头戏,Object-C的网络请求大家都不陌生,不过感觉很熟悉的貌似也不多,因为第三方的库用起来更加方便,比如我们所熟知的AFNetworking,在Swift中,也存在一些封装的比较好的网络请求库,不过我今天说的不是那种第三方的,而是原生的请求方...