链式
在 GCD (Grand Central Dispatch) 上对队列中关闭块（块）进行链式处理。
Chain 受到 Async 的启发。
特性
- 在 GCD 上对队列中关闭块（块）进行链式处理。
- 将对象传递到下一个队列
- 更少的代码缩进。
示例
基本
Chain.main {
// called first
// called at main thread queue
print("start")
return "1"
}.background { result in
// called second
// called at background qos class thread queue
print(result) // Optional(1)
return "2"
}.userInteractive { result in
// called third
// called at userInteractive qos class thread queue
print(result) // Optional(2)
return "3"
}.userInitiated { result in
// called fourth
// called at userInitiated qos class thread queue
print(result) // Optional(3)
return "4"
}.onDefault { result in
// called fifth
// called at default qos class thread queue
print(result) // Optional(4)
return "5"
}.run(.Main) { result in
// called last
// called at main thread queue
print(result) // Optional(5)
print("completion")
}自定义队列
let customQueue = dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0)
Chain.custom(customQueue) {
// called first
// called at customQueue
return nil
}.onDefault { result in
// called second
// called at default qos class thread queue
return result
}.main { result in
// called third
// called at main thread queue
return result
}.custom(customQueue) { result in
// called fourth
// called at customQueue
return result
}.run()之后
Chain.main {
// called first
// called at main thread queue
print("start after: \(NSDate().description)")
return "1"
}.after(seconds: 5) { result in
// called second
// called to 5 seconds after the previous block
// called at background qos class thread queue
print(result) // Optional(1)
return "after 2: \(NSDate().description)"
}.userInteractive { result in
// called third
// called at userInteractive qos class thread queue
print(result) // Optional(2)
return "after 3: \(NSDate().description)"
}.after(Queue.Utility, seconds: 5) { result in
// called fourth
// called to 5 seconds after the previous block
// called at utility qos class thread queue
print(result) // Optional(3)
return "after 4: \(NSDate().description)"
}.run(.Main) { result in
// called last
// called at main thread queue
print(result) // Optional(4)
print("after completion: \(NSDate().description)")
}等待
Chain.main {
// called first
// called at main thread queue
print("start wait: \(NSDate().description)")
return "1"
}.wait(seconds: 5).background { result in
// called to 5 seconds after the previous block
// called at background qos class thread queue
print("wait 2: \(NSDate().description)")
return result
}.wait(seconds: 5).main { result in
// called to 5 seconds after the previous block
// called at main thread queue
print("wait 3: \(NSDate().description)")
return result
}.run()
需求
- Xcode 10.2+
| 操作系统 | Swift | |
|---|---|---|
| v1.2.x | iOS 8+ | 3.0 |
| v1.3.x | iOS 10+ | 5.0 |
安装
CocoaPods
Chain 通过 CocoaPods 提供。要安装它，只需将以下行添加到 Podfile 文件中
use_frameworks!
pod "SwChain"Carthage
要使用 Carthage 将 Chain 集成到 Xcode 项目中，请在 Cartfile 文件中指定它
github "xxxAIRINxxx/Chain"许可协议
MIT 许可协议。更多信息请参阅 LICENSE 文件。