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func dicArrayToJson(_ dicArray:[Dictionary<String,String>])->String{ //首先判断能不能转换 if (!JSONSerialization.isValidJSONObject(dicArray)) { //print("is not a valid json object") return "" } //利用OC的json库转换成OC的NSData, //如果设置options为NSJSONWritingOptions.PrettyPrinted,则...
The compiler flags an error for the code because it doesn’t know the type of the array’s elements. The elements of an empty array may be of any given type. So you need to mention the elements’ type to avoid the error. letemptyScores:[Int]=[] emptyScoresis of type[Int], so th...
letcellIdentifier="Cell"vartoDoData=[Add]()override funcviewDidLoad(){super.viewDidLoad()setup()registerCell()}funcsetup(){self.title="To Do List"self.navigationItem.rightBarButtonItem=UIBarButtonItem(barButtonSystemItem:UIBarButtonSystemItem.Add,target:self,action:"addItem")}funcregisterCell()...
var buffer = CustomData (NSData ()) for _ in 0..<5 { buffer.append (x) // 只会在第一次调用时进行复制 } 提示:对于 ObjC 类型 isKnownUniquelyReferenced 会直接返回 false。 减少使用 Objc 特性 避免使用 Objc 类型 尽可能避免在 Swift 中使用 NSString/NSArray/NSDictionary 等 ObjC 基础类型...
For your convenience, CryptoSwift provides two functions to easily convert an array of bytes to Data or Data to an array of bytes:Data from bytes:let data = Data([0x01, 0x02, 0x03])Data to Array<UInt8>let bytes = data.bytes // [1,2,3]...
The app's Info.plist must contain an NSPhotoLibraryUsageDescription key with a string value explaining to the user how the app uses this data." 解决方法:iOS10之后的权限问题,在info.plist里添加相应的权限以及描述即可。 本例中权限为: <key>NSCameraUsageDescription</key> <string>PhotoMe needs ...
// Set the body to the image in byte array format. request.httpBody = pngImage request.httpMethod = "POST" let task = URLSession.shared.dataTask(with: request) { data, response, error in guard let data = data, let response = response as? HTTPURLResponse, // Check fo...
private let defaults = UserDefaults.standard // - reference to application's UserDefaults dictionary private let DEFAULTS_KEY = "TASK_LIST" // - the key we use to retrieve/save our array of TaskItems init() { MemoryManager.tasks = [TaskItem]() retrieveData() saveData() } // - decode...
// Set the body to the image in byte array format. request.httpBody = pngImage request.httpMethod = "POST" let task = URLSession.shared.dataTask(with: request) { data, response, error in guard let data = data, let response = response as? HTTPURLResponse, // Check for ne...