如何从当前窗口界面切换到另一个窗口界面
在程序中，经常会在不同的窗口界面中互相切换。本文，将介绍如何进行窗口界面的切换。
下面采用的示例以文章《在程序代码中设定控件调用的方法 》代码为基础。
操作处理过程：
（1）新建一个窗口视图；
（2）调用打开新建的窗口视图；
第1步：新建一个窗口视图
鼠标选中项目的classes目录，鼠标右键选中菜单 [Add > New File...].
在界面上选择[iOS > Cocoa Touch Class > UIViewController subclass ]，并且选中 With XIB for user interface.
新建的视图取名为 NewViewController
打开文件 NewViewController.xib
修改 NewViewController.h
#import <UIKit/UIKit.h>
@interface NewViewController : UIViewController {
}
-(IBAction)backButtonClicked:(id)sender;
@end
修改 NewViewController.m
#import "NewViewController.h"
@implementation NewViewController
-(IBAction)backButtonClicked:(id)sender{
[self.view removeFromSuperview];
}
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
@end
然后，在 NewViewController.xib 中将按钮控件的点击事件绑定方法backButtonClicked。
第2步：调用打开新建的窗口视图；
修改 FirstViewController.m
#import "FirstViewController.h"
#import "NewViewController.h"
@implementation FirstViewController
NewViewController *newViewController;
@synthesize label,button;
-(IBAction)myButtonClicked:(id)sender{
newViewController=[[NewViewController alloc] initWithNibName:@"NewViewController" bundle:nil];
[self.view addSubview:newViewController.view];
/*
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"my alert"
message:@"button is clicked"
delegate:self
cancelButtonTitle:@"Ok"
otherButtonTitles: nil];
[alert show];
[alert release];
*/
}
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
//create the label
CGRect frame=CGRectMake(50, 30, 200, 45);
label=[[UILabel alloc] initWithFrame:frame];
label.text=@"This is a label";
//create the button
frame=CGRectMake(50, 100, 200, 45);
button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame=frame;
[button setTitle:@"OK" forState:UIControlStateNormal];
[button addTarget:self
action:@selector(myButtonClicked:)
forControlEvents:UIControlEventTouchUpInside];
//add the label and button into current view.
[self.view addSubview:label];
[self.view addSubview:button];
[super viewDidLoad];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[newViewController release];
[label release];
[button release];
[super dealloc];
}
@end
执行后，点击界面上的［OK］按钮，即显示新建的窗口视图；再点击新窗口视图的［back］按钮，即显示前一窗口。
