Swiftは日常メモを使います.
17557 ワード
//-------------------
var totalPrice: Int = 0 {
willSet(newTotalPrice) { // new+
println(" totalPrice ( :\(totalPrice)) : \(newTotalPrice)")
//to do somthing before set.
}
didSet {
if totalPrice > oldValue {
println(" \(totalPrice - oldValue)")
}
}
}
totalPrice ( :0) : 5
5
5
/ # ， （ ）
func setComputerConfig(#cpu:String,disk:String,mem:String,mon:String)
{ }
func addNumbers(numbers: Int...) ->Int {
var totle = 0
for number in numbers {
totle += number
}
return totle
}
func constantParameter(var version: String) -> String {
version = " ：" + version
return version;
}
var version = "4.0.0"
var ver = constantParameter(version)
println(ver)
println(version)
：4.0.0
4.0.0
//
func testfunctionReturn(instruction : String) -> (Int,Int) -> Int
{
func Multiplication(a:Int,b:Int) ->Int
{
return a * b
}
return Multiplication
}
//
// simpleAssert(testNumber % 2 == 0, "testNumber isn't an even number.")
func simpleAssert(condition: () -> Bool, message: String) {
if !condition() {
println(message)
}
}
：
“ class, deinit, enum, extension, func, import, init, let, protocol, static, struct, subscript, typealias, var.”
：
“ break, case, continue, default, do, else, fallthrough, if, in, for, return, switch, where, while.”
：
“ as, dynamicType, is, new, super, self, __COLUMN__, __FILE__, __FUNCTION__, __LINE__”
// :
“didSet, get, inout, mutating, override, set, unowned, unowned(safe), unowned(unsafe), weak , willSet”
http://blog.csdn.net/fengsh998/article/details/32133809
NSNotificationCenter.defaultCenter().postNotificationName("Notification1", object: nil)
private var observer : NSObjectProtocol!
observer = NSNotificationCenter.defaultCenter().addObserverForName("Notification1", object: nil, queue: NSOperationQueue.mainQueue(), usingBlock: { (note:NSNotification!) -> Void in
self.contentChangeNotification(note)
});
private extension ViewController {
func contentChangeNotification(notification: NSNotification) {
println("1111")
var text = btn.titleLabel!.text! as NSString
if text.isEqualToString(" ") {
self.navigationItem.prompt = nil
btn.setTitle(" ", forState: .Normal)
} else {
self.navigationItem.prompt = " ";
// 1 s
let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(1.0 * Double(NSEC_PER_SEC)))
dispatch_after(popTime, dispatch_get_main_queue(), { () -> Void in
self.navigationItem.prompt = " ";
});
}
}
}
GCD
async ,block ,queue
dispatch_async(dispatch_queue_t queue, dispatch_block_t block);
dispatch_async(dispatch_get_global_queue(Int(QOS_CLASS_UTILITY.value), 0), { () -> Void in
var url = NSURL(string: "http://s.qdcdn.com/cl/10911573,800,450.jpg")
var imgData = NSData(contentsOfURL: url!)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
imageView.image = UIImage(data: imgData!)
});
});
， ， ，
var myQueue = dispatch_queue_create("com.inlee.ce0", DISPATCH_QUEUE_SERIAL)
dispatch_async(myQueue, { () -> Void in
println("0")
var url = NSURL(string: "http://img.lanrentuku.com/img/allimg/1311/13853799337947.jpg")
var imgData = NSData(contentsOfURL: url!)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
imageView.image = UIImage(data: imgData!)
});
});
dispatch_async(myQueue, { () -> Void in
println("1")
var url = NSURL(string: "http://img.lanrentuku.com/img/allimg/1311/13853799337947.jpg")
var imgData = NSData(contentsOfURL: url!)
if (imgData != nil){
dispatch_async(dispatch_get_main_queue(), { () -> Void in
imageView2.image = UIImage(data: imgData!)
});
}
});
dispatch_async(myQueue, { () -> Void in
println("2")
var url = NSURL(string: "http://media.vector4free.com/normal/chick.jpg")
var imgData = NSData(contentsOfURL: url!)
if (imgData != nil){
dispatch_async(dispatch_get_main_queue(), { () -> Void in
imageView3.image = UIImage(data: imgData!)
});
}
});
Concurrent queue(global dispatch queue):
, queue , . dispatch_get_global_queue .
var myQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
dispatch_async(myQueue, { () -> Void in
NSThread.sleepForTimeInterval(6)
println("6")
});
dispatch_async(myQueue, { () -> Void in
NSThread.sleepForTimeInterval(4)
println("4")
});
dispatch_async(myQueue, { () -> Void in
NSThread.sleepForTimeInterval(1)
println("1")
});
1
4
6
http://blog.csdn.net/wildfireli/article/details/18668897
dispatch_group_async
var queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
var group = dispatch_group_create()
dispatch_group_async(group, queue, { () -> Void in
NSThread.sleepForTimeInterval(6)
println("6")
});
dispatch_group_async(group, queue, { () -> Void in
NSThread.sleepForTimeInterval(3)
println("3")
});
dispatch_group_async(group, queue, { () -> Void in
NSThread.sleepForTimeInterval(1)
println("1")
});
dispatch_group_notify(group, dispatch_get_main_queue(), { () -> Void in
println(" ！")
});
1
3
6
！
map
//map ，
let numbers = [1,2,3]
let doubledNumbers = numbers.map {$0 * 2 }
println(doubledNumbers)
[2, 4, 6]
//--------
let num = Optional(815)
println(num)
let transNum = num.map {$0 * 2}.map {$0 % 2 == 0}
println(transNum)
Optional(815)
Optional(true)
//———
func map< U>(transformFunction: T -> U) -> Container< U>
T ，U 。 。
//------------
let jsArr = ["abc", "12", "n", "klomj"]
let jsArr2 = jsArr.map {$0.uppercaseString}
let jsArr3 = jsArr.map {($0 as NSString).length}
println(jsArr2)
println(jsArr3)
[ABC, 12, N, KLOMJ]
[3, 2, 1, 5]
swift
NSSetUncaughtExceptionHandler(<#CFunctionPointer<NSUncaughtExceptionHandler>#>)
NSSetUncaughtExceptionHandler(exceptionHandlerPtr)
//———
OC ，
// volatile : , , .
// “extern”，
@interface ExceptinHandler : NSObject
volatile void exceptionHandler(NSException *exception);
extern NSUncaughtExceptionHandler *exceptionHandlerPtr;
@end
#import "ExceptinHandler.h"
@implementation ExceptinHandler
volatile void exceptionHandler(NSException *exception) {
// Do stuff
}
NSUncaughtExceptionHandler *exceptionHandlerPtr = &exceptionHandler;
@end
id
private struct Constants {
static let sharedManager = LocationManager()
}
public class var sharedManager: LocationManager {
return Constants.sharedManager
}
//1
class var sharedInstance: LibraryAPI {
//2
struct Singleton {
//3
static let instance = LibraryAPI()
}
//4
OC #define
public struct HUDAssets {
public static let rotationLockImage = HUDAssets.bundledImage(named: "rotation_lock")
internal static func bundledImage(named name: String) -> UIImage {
let bundleIdentifier = "com.NSExceptional.PKHUD"
return UIImage(named: name, inBundle: NSBundle(identifier: bundleIdentifier), compatibleWithTraitCollection: nil)!
}
}
HUDAssets.ringerMutedImage
public struct Tool {
public static let greenColor = UIColor(red: 35.0/255.0, green: 153.0/255.0, blue: 73.0/255.0, alpha: 0.8)
}
set/get
public var userInteractionOnUnderlyingViewsEnabled: Bool {
get {
return !window.userInteractionEnabled
}
set {
window.userInteractionEnabled = !newValue
}
}
private let backgroundView: UIView = {
let view = UIView()
view.backgroundColor = UIColor(white:0.0, alpha:0.25)
view.alpha = 0.0;
return view;
}()
//
private var currentAlbumData : (titles:[String], values:[String])?
if (currentAlbumData != nil) {}
if let albumData = currentAlbumData {}
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName:UIColor.whiteColor(), NSFontAttributeName:UIFont(name: "AvenirNextCondensed-DemiBold", size: 22.0)!]