View Programming Guide for iOS
http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/Introduction/Introduction.html
View Controller Programming Guide for iOS
http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html
UIScreen Class Reference
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html
UIView Class Reference
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIView_Class/UIView/UIView.html
UIWindow Class Reference
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html
UIViewController Class Reference
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html
1、UIScreen可以获取设备屏幕的大小。
// 整个屏幕的大小 {{0, 0}, {320, 480}} CGRect bounds = [UIScreen mainScreen].bounds; NSLog(@"UIScreen bounds: %@", NSStringFromCGRect(bounds)); // 应用程序窗口大小 {{0, 20}, {320, 460}} CGRect applicationFrame = [UIScreen mainScreen].applicationFrame; NSLog(@"UIScreen applicationFrame: %@", NSStringFromCGRect(applicationFrame));
2、UIView对象定义了一个屏幕上的一个矩形区域,同时处理该区域的绘制和触屏事件。
可以在这个区域内绘制图形和文字,还可以接收用户的操作。一个UIView的实例可以包含和管理若干个子UIView。
ViewController.m
- (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; UIView* myView = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 100)]; myView.backgroundColor=[UIColor redColor]; [self.view addSubview:myView]; }
3、UIWindow对象是所有UIView的根,管理和协调的应用程序的显示
UIWindow类是UIView的子类,可以看作是特殊的UIView。一般应用程序只有一个UIWindow对象,即使有多个UIWindow对象,也只有一个UIWindow可以接受到用户的触屏事件。
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { UIWindow *myWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; myWindow.backgroundColor=[UIColor whiteColor]; [myWindow makeKeyAndVisible]; _window = myWindow; return YES; }
4、UIViewController对象负责管理所有UIView的层次结构,并响应设备的方向变化。
AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { UIWindow *myWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; myWindow.backgroundColor=[UIColor whiteColor]; UIViewController *myViewController = [[UIViewController alloc] initWithNibName:nil bundle:nil]; myWindow.rootViewController = myViewController; [myWindow makeKeyAndVisible]; _window = myWindow; return YES; }
// ViewController.h #import <UIKit/UIKit.h> @interface ViewController : UIViewController @end // ViewController.m #import "ViewController.h" @implementation ViewController - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; UIView* myView = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 50)]; myView.backgroundColor=[UIColor redColor]; [self.view addSubview:myView]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } @end // AppDelegate.h #import <UIKit/UIKit.h> @class ViewController; @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @property (strong, nonatomic) ViewController *viewController; @end // AppDelegate.m #import "AppDelegate.h" #import "ViewController.h" @implementation AppDelegate @synthesize window = _window; @synthesize viewController = _viewController; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil]; self.window.rootViewController = self.viewController; [self.window makeKeyAndVisible]; return YES; } @end // main.m #import <UIKit/UIKit.h> #import "AppDelegate.h" int main(int argc, char *argv[]) { @autoreleasepool { return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); } }
转帖:http://www.0jl.com/?p=476