在另一个视图顶部添加一个视图iOS

我需要帮助。我正在设计UI，并且一直在使用FRAME和CENTER属性来布局视图。这两个对我都非常有帮助。我还使用将元素添加为UIViews容器的子视图的技术。

但是，现在，我想将UIView放置在另一个视图的顶部。请看我的照片。屏幕底部的按钮已经设置并且现在非常完美，我很难将UIView（文本字段的容器）放在按钮/分隔符上方。

我只是从iOS开始，我想已经有1个月了。我以编程方式了解约束的基本知识，但我现在不想尽可能多地使用它。

PS。我以编程方式制作屏幕。

我在此屏幕中的代码示例

// start adding container
UIView *container2 = [[UIScrollView alloc] init];
container2.frame = CGRectMake(0, 0, [TPRConstants screenWidth] * 0.95, heightOfScrollView);
container2.backgroundColor = [UIColor blueColor];
container2.contentSize = CGSizeMake([TPRConstants screenWidth] * 0.95, 250);
[self.view container2];

// stuffs and subviews/textfields inside the container
self.phoneTextField = [[UITextField alloc] init];
_phoneTextField.frame = CGRectMake(0, 200, scrollView.frame.size.width, 50);
_phoneTextField.delegate = self;
_phoneTextField.borderStyle = UITextBorderStyleNone;
_phoneTextField.background = [UIImage imageNamed:@"textfieldLogIn.png"];
_phoneTextField.backgroundColor = [UIColor clearColor];
[_phoneTextField setKeyboardType:UIKeyboardTypeNumberPad];
[container2 addSubview:_phoneTextField];

// add container for divider and log in button
UIView *container = [[UIView alloc] init];
container.frame = CGRectMake(0, 0, [TPRConstants screenWidth], 80);
container.backgroundColor = [UIColor whiteColor];
container.center = CGPointMake([TPRConstants screenWidth] * 0.50, [TPRConstants screenHeight] - container.frame.size.height/2);
[self.view addSubview:container];

// add divider
UIImageView *divider = [[UIImageView alloc] initWithFrame:CGRectMake(0, 10, container.frame.size.width, 5)];
divider.image = [UIImage imageNamed:@"dividerCP.png"];
divider.backgroundColor = [UIColor clearColor];
divider.contentMode = UIViewContentModeCenter;
[container addSubview: divider];

// add save login
UIButton *saveBtn = [UIButton buttonWithType:UIButtonTypeCustom];
saveBtn.frame = CGRectMake(0, 0, container.frame.size.width * 0.95, 50);
saveBtn.center = CGPointMake(container.frame.size.width /2 , (container.frame.size.height - saveBtn.frame.size.height/2) - 10 );
[saveBtn addTarget:self action:@selector(saveBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[saveBtn setBackgroundImage:[UIImage imageNamed:@"logoutupCP.png"] forState:UIControlStateNormal];
[saveBtn setTitle:@"Save" forState:UIControlStateNormal];
[saveBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[saveBtn setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
[saveBtn setBackgroundImage:[UIImage imageNamed:@"logoutdownCP.png"] forState:UIControlStateHighlighted];
[container addSubview: saveBtn];