iphone---MyfistLabel

最新推荐文章于 2022-11-15 18:46:45 发布

最新推荐文章于 2022-11-15 18:46:45 发布 · 99 阅读

本文介绍了一个简单的iOS应用程序开发过程，包括使用UIKit创建视图控制器、添加标签和按钮，并设置了相应的属性，如背景颜色、文字颜色等。此外，还介绍了如何在AppDelegate中设置窗口和根视图控制器。

// hello.h

// MyFirstLabel

#import <UIKit/UIKit.h>

@interface hello : UIViewController

{

UILabel* _label;

UIButton* _button;

}

@property(nonatomic,retain)UILabel* _label;

@property(nonatomic,retain)UIButton* button;

@end

// hello.m

// MyFirstLabel

#import "hello.h"

@implementation hello

@synthesize button=_button;

@synthesize _label;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

}

return self;

}

- (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.

}

#pragma mark - View lifecycle

// 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

{

// self.view.backgroundColor = [UIColor blueColor];

_label= [[UILabel alloc]initWithFrame:CGRectMake(50, 20, 150, 80)];

_label.text=@"I love you!";

_label.textAlignment=UITextAlignmentCenter;

_label.textColor=[UIColor redColor];

_label.font=[UIFont systemFontOfSize:30];

[self.view addSubview:_label];

_button=[UIButton buttonWithType:UIButtonTypeRoundedRect];

_button.frame=CGRectMake(100, 100, 100, 60);

[_button setTitle:@"love" forState:UIControlStateNormal];

[_button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

[_button setBackgroundColor:[UIColor greenColor]];

_button.alpha = 0.5f;

[self.view addSubview:_button];

[super viewDidLoad];

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

// Return YES for supported orientations

return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end

// AppDelegate.h

// MyFirstLabel

#import <UIKit/UIKit.h>

@class hello;

@interface AppDelegate : UIResponder <UIApplicationDelegate>

{

hello* _h;

}

@property(nonatomic,retain)hello* h;

@property (strong, nonatomic) UIWindow *window;

@end

// AppDelegate.m

// MyFirstLabel

#import "AppDelegate.h"

#import "hello.h"

@implementation AppDelegate

@synthesize window = _window;

@synthesize h=_h;

- (void)dealloc

{

[_window release];

[super dealloc];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

// Override point for customization after application launch.

self.window.backgroundColor = [UIColor whiteColor];

hello* he=[[hello alloc]init];

self.h=he;

// self.window.rootViewController = self.h;

[self.window addSubview:self.h.view];

[self.window makeKeyAndVisible];

return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application

{

Sent when the application is aboutto move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.

Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{

Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.

If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

}

- (void)applicationWillEnterForeground:(UIApplication *)application

{

Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

}

- (void)applicationWillTerminate:(UIApplication *)application

{

Called when the application is about to terminate.

Save data if appropriate.

See also applicationDidEnterBackground:.

}

@end