循环引用
/// 完成回调属性
var finishedCallBack: (()->())?
/// 加载数据
///
/// - parameter finished: 完成回调
func loadData(finished: () -> ()) {
self.finishedCallBack = finished
print("开始加载数据...")
// ...
working()
}
func working() {
finishedCallBack?()
}
deinit {
print("网络工具 88")
}
class ViewController: UIViewController {
var tools: NetworkTools?
override func viewDidLoad() {
super.viewDidLoad()
tools = NetworkTools()
tools?.loadData() {
print("come here \(self.view)")
}
}
/// 与 OC 中的 dealloc 类似，注意此函数没有()
deinit {
print("控制器 88")
}
}
- 循环链：self(ViewController) -> tools(NetworkTools) ->finishedCallBack -> finished -> self(ViewController)
解决办法
loadData { [weak self] in
print("\(self?.view)")
}
- OC
__weak typeof(self) weakSelf
