The product has a requirement that the loading animation pops up after network request 3, but I don’t want to use NSTimer. Is there any easy way
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光陰似箭催人老，日月如移越少年。
Objective-C:
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// show loading
});Swift 3: (Note: self cannot be omitted in block)
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 3) {
// show loading
}
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