开发中问题解决

1.popToViewController的用法

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1]animated:YES];

for (UIViewController *temp in self.navigationController.viewControllers) {
if ([temp isKindOfClass:[SubmitOrderController class]]) {
[self.navigationController popToViewController:temp animated:YES];
}
}

2.想改变视图的透明度，但不改变视图上控件的透明度

<span style="color:#333333;">self.view.backgroundColor =[UIColor colorWithWhite:0.0f alpha:0.5];</span>
后面的参数表示灰度，从0-1之间表示从黑到白的变化，alpha就是你想调整的透明度