AnYuan

//file
let identifier = "group.com.baidu.documents" 
var sharedContainerURL = NSFileManager.defaultManager().containerURLForSecurityApplicationGroupIdentifier(identifier)
if let sharedContainerURL = sharedContainerURL {
  let documentURL = sharedURL. URLByAppendingPathComponent("UserData.json")
  let data = ... // Some JSON data.
  // Write data to disk
}

//Core Data and SQLite

AnYuan

//before Swift 1.2
private let sharedInstance = MyManager()
class MyManager {
  class var sharedManager: MyManager {
    return sharedInstance
  }
}

//Swift 1.2
//Swift 1.2之前还不支持static let 和 static var 这样的存储类变量。但是1.2中Swift添加了类变量的支持--by onevcat

AnYuan

//AVFoundation Method
let size = AVMakeRectWithAspectRatioInsideRect(image.size, contentFrame).size

//Helper Methods
  func sizeWithAspectRatioInsideRect(aspectRatio: CGSize, boundingRect: CGRect) -> CGSize {
    let widthRatio = boundingRect.size.width / aspectRatio.width
    let heightRatio = boundingRect.size.height / aspectRatio.height
    let ratio = min(widthRatio, heightRatio)
    let transform = CGAffineTransformMakeScale(ratio, ratio)
    return CGSizeApplyAffineTransform(aspectRatio, transform)

AnYuan

//
//  DarwinNotificationHelper.h
//  MeatCooker
//
//  Created by Jack Wu on 2015-02-02.
//  Copyright (c) 2015 Ray Wenderlich. All rights reserved.
//

#import <Foundation/Foundation.h>

AnYuan

//
//  DarwinNotificationHelper.m
//  MeatCooker
//
//  Created by Jack Wu on 2015-02-02.
//  Copyright (c) 2015 Ray Wenderlich. All rights reserved.
//

#import "DarwinNotificationHelper.h"

AnYuan

#import <Foundation/Foundation.h>
#import <WatchKit/WatchKit.h>

@interface AYWatchDeviceCacheHelper : NSObject

+ (void)addImageToCache:(UIImage *)image
              imageName:(NSString *)name;

+ (BOOL)cacheContainsImageName:(NSString *)imageName;
@end

AnYuan

#import "AYWatchDeviceCacheHelper.h"

@implementation AYWatchDeviceCacheHelper

+ (void)addImageToCache:(UIImage *)image
              imageName:(NSString *)name
{
    WKInterfaceDevice *device = [WKInterfaceDevice currentDevice];
    while ([device addCachedImage:image name:name] == NO) {
        BOOL success = [[self class] removeRandomImageFromCache];

AnYuan

let utf8str: NSData = str.dataUsingEncoding(NSUTF8StringEncoding)
let utf8str = str.dataUsingEncoding(NSUTF8StringEncoding)
 
let base64Encoded:NSString = utf8str.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
let base64Encoded = utf8str.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
 
let data: NSData = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.fromRaw(0)!)
let data = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.fromRaw(0)!)
 
let base64Decoded: NSString = NSString(data: data, encoding: NSUTF8StringEncoding)

AnYuan

import AVFoundation

if let asset = AVAsset(URL: videoURL) {
  let durationSeconds = CMTimeGetSeconds(asset.duration)
  let generator = AVAssetImageGenerator(asset: asset)

  generator.appliesPreferredTrackTransform = true

  let time = CMTimeMakeWithSeconds(durationSeconds/3.0, 600)
  var thumbnailImage: CGImageRef

AnYuan

protocol ExcutableQueue {
    var queue: dispatch_queue_t { get }
}

extension ExcutableQueue {
    func execute(closure: () -> Void) {
        dispatch_async(queue, closure)
    }
}