UIViewController(视图控制器)下的View切换

作用:
UIViewController可以实现创建视图并且切换视图而且有过度效果(就是说UIViewController自带一个View
并且可以控制这个View
所以我们所有的按钮都写在这个View)

步骤:



以下步骤在AppDelegate.m里执行

(1).创建一个rootViewController对象,父类是UIViewController
RootViewController *rootVC = [[RootViewController
alloc]init];

(2).给window设置根视图控制器并进行内存管理

self.window.rootViewController = rootVC;
[rootVC release];

以下步骤在RootViewController.m里viewDidLoad书写

(3).View设置背景颜色
注意:视图的创建和铺设都在viewDidLoad方法里进行
self.view.backgroundColor = [UIColor
yellowColor];

(4).铺3个textfield

(7).给三个按钮设置代理人
UITextField *textField1 = [[UITextField
alloc]initWithFrame:CGRectMake(100,
200, 150,
40)];
textField1.layer.borderWidth =
1;
textField1.layer.cornerRadius =
10;
[self.view
addSubview:textField1];
textField1.delegate =
self ;// (7)
[textField1 release];

UITextField *textField2 = [[UITextField
alloc]initWithFrame:CGRectMake(100,
300, 150,
40)];
textField2.layer.borderWidth =
1;
textField2.layer.cornerRadius =
10;
[self.view
addSubview:textField2];
textField2.delegate =
self ;// (7)
[textField2 release];

UITextField *textField3 = [[UITextField
alloc]initWithFrame:CGRectMake(100,
400, 150,
40)];
textField3.layer.borderWidth =
1;
textField3.layer.cornerRadius =
10;
[self.view
addSubview:textField3];
textField3.delegate =
self ;// (7)
[textField3 release];

(5).铺一个button并调用方法(功能键用于调用随机颜色或者切换到另一张视图)

UIButton *button = [UIButton
buttonWithType:UIButtonTypeSystem];
button.frame =
CGRectMake(100,
500, 150,
40);
[button setTitle:@"下一页"
forState:UIControlStateNormal];
[self.view
addSubview:button];
button.layer.borderWidth =
1;
button.layer.cornerRadius =
10;
[button addTarget:self
action:@selector(click:)
forControlEvents:UIControlEventTouchUpInside];
注意:在运行之后弹出的键盘会把textField3挡住,(6)以后要解决这个问题

(6).签订协议

@interface
RootViewController ()<UITextFieldDelegate>

(8).设置这个使整个View升高的方法方法
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
只要输入框被激活,就会触发这个方法(点一下就被激活)
if (textField.frame.origin.y
> HEIGHT /
2) {只要输入框在屏幕高度的一半以下

先做一个差值
CGFloat height = textField.frame.origin.y
- self.view.frame.size.height /
2;

self.view.center =
CGPointMake(self.view.center.x,
self.view.center.y - height);
}
return
YES;
}

(9).等到编译结束的时候让View回复原来的位置
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
注意:整个是在移动self.view,父视图的移动会让所有的子视图一同移动,而且相对父视图的左边位置不会发生变化,所以,可以沿用上一个方法的判断
if (textField.frame.origin.y
> HEIGHT / 2) {
先做一个差值
CGFloat height = textField.frame.origin.y
- HEIGHT / 2;
self.view.center =
CGPointMake(self.view.center.x,
self.view.center.y + height);
}
return
YES;
}

现在要实现视图转换功能(都是UIViewController的跳转)

首先需要再创建一个类SecondViewController继承于UIViewController

现在要实现几个View的UIViewController(SecondViewController与RootViewController所携带的View的跳转)以下步骤在SecondViewController.m中进行

(1).创建一个button

UIButton *button = [UIButton
buttonWithType:UIButtonTypeSystem];
button.frame =
CGRectMake(100,
200, 100,
30);
button.backgroundColor = [UIColor
yellowColor];
self.view.backgroundColor = [UIColor
cyanColor];
button.layer.borderWidth =
1;
button.layer.cornerRadius =
10;
[self.view
addSubview:button];

(2).输入文本和调用方法
[button setTitle:@"返回"
forState:UIControlStateNormal];
[button addTarget:self
action:@selector(click:)
forControlEvents:UIControlEventTouchUpInside];

(3).点击返回,回到前一页面

-(void)click:(UIButton *)button
{
[self
dismissViewControllerAnimated:YES
completion:^{}];
}

以下步骤在RootViewController.m里进行
首先引头文件
#import "SecondViewController.h"

(4).铺一个button并调用方法(功能键用于调用随机颜色或者切换到另一张视图)该步骤要写在-
(void)viewDidLoad方法内

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
button.frame = CGRectMake(100, 500, 150, 40);
[button setTitle:@"下一页" forState:UIControlStateNormal];
[self.view addSubview:button];
button.layer.borderWidth = 1;
button.layer.cornerRadius = 10;
[button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

被调用的用于切换视图的方法如下

- (void)click:(UIButton *)button
{
(5).创建一个SecondViewController的对象
SecondViewController *secondVC = [[SecondViewController
alloc]init];

(6).设置跳转时候的动画效果
[secondVC
setModalTransitionStyle:UIModalTransitionStylePartialCurl];

(7).进行跳转

[self
presentViewController:secondVC
animated:YES
completion:^{}];

(8).内存管理
[secondVC release];

}