iOS判断当前ViewController是push还是present方式显示的
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if ([self respondsToSelector:@selector(dismissViewControllerAnimated:completion:)]) {
//判断1
[self dismissViewControllerAnimated:YES completion:nil];
} else if ([self.navigationController respondsToSelector:@selector(popViewControllerAnimated:)]) {
//判断2
[self.navigationController popViewControllerAnimated:YES];
//判断1
[self dismissViewControllerAnimated:YES completion:nil];
} else if ([self.navigationController respondsToSelector:@selector(popViewControllerAnimated:)]) {
//判断2
[self.navigationController popViewControllerAnimated:YES];
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