UITableView *ta = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, jqW, jqH) style:UITableViewStylePlain];
[self.view addSubview:ta];
ta.delegate = self;
ta.dataSource = self;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"%@",NSStringFromUIEdgeInsets(self.view.safeAreaInsets));
//{64, 0, 0, 0}
NSLog(@"%@",NSStringFromUIEdgeInsets(ta.safeAreaInsets));
//{64, 0, 0, 0}
});
需要加上一个延时，待视图显示出来了，打印的结果才正确.
SafeAreaInsets值反映了view被覆盖的部分
additionalSafeAreaInsets：在原有基础上加减响应的安全距离
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