print("开始") let time : TimeInterval = 10.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()+time) {
print("10秒后结束")
}
print("开始") let time : TimeInterval = 10.0
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()+time) {
print("10秒后结束")
}
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