var myGroup = DispatchGroup()
override func viewDidLoad() {
super.viewDidLoad()
for i in 0 ..< 5 {
myGroup.enter()
Alamofire.request("https://httpbin.org/get", parameters: ["foo": "bar"]).responseJSON { response[......]
As of Swift 2.0, you don't need to write your own extension to filter nil values from an Array, you can use flatMap, which flattens the Array and filters nils:
let optionals : [String?] = ["a", "b", nil, "d"]
let nonOptionals = optionals.flatMap{$0[......]
http://stackoverflow.com/questions/38408645/swift-regex-to-match-unicodes
The Unicode code point of the emoji you have shown is U+1F600.
(Unicode 9.0 Character Code Charts - Emoticons)
And your regex pattern (which may work for UTF-16 repres[......]
关键摘要：
1、swift中调用OC，引用 项目名-Bridging-Header.h
2、OC中调用swift，引用 项目名-Swift.h
转载自：http://www.it165.net/pro/html/201501/32179.html
对于已经工作的开发者,并不适合也没有条件从一个全新的swift项目开始,进行开发. 虽然网上关于swift和oc混合编程的教程比较多,但是大多是基于 swift项目的,所以对咱们 OCer的参考价值有一定折扣.
现在swi[......]