UIView的使用-创新互联
#import "AppDelegate.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//创建一个窗口对象，（UIEWindow），让窗口根屏幕一样大
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //属性是retain或者copy修饰，都要dealloc
// Override point for customization after application launch.
//给这个全屏的窗口设置一个颜色
self.window.backgroundColor = [UIColor whiteColor];
//把window设置为主窗口而且可见的，注意：一个应用程序只能显示一个window
[self.window makeKeyAndVisible];
//学习新类 －－ 1.看继承关系 2.看新类没有没有自己的初始化方法／构造器
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 150, 100, 130)];
//设置属性
view.backgroundColor = [UIColor grayColor];
//让视图显示NO／隐藏YES
//隐藏的时候，会吧view所有的子视图全部隐藏
view.hidden = NO;
//view透明度)0-1)
view.alpha = 0.5;
//将一个view添加到另一view上
[_window addSubview:view]; //将view添加到window上 。
NSLog(@"%@",view.superview);
NSLog(@"111111%@",_window.subviews);
//tag值 作用：方便父视图迅速找到某一子视图，tag值作为一个视图的标记
view.tag = 1000;
//重新调整view的位置和大小
view.frame = CGRectMake(0, 0, 100, 100);
//view的中心点，来调整view的位置
view.center = CGPointMake(150, 200);
//内存管理
[view release];
//重新创建一个view1
UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(150, 250, 50, 100)];
view1.backgroundColor = [UIColor blueColor];
[_window addSubview:view1];
[view1 release];
//重新创建一个view2
UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(200, 50, 50, 100)];
view2.backgroundColor = [UIColor redColor];
[_window addSubview:view2];
[view2 release];
//重新创建一个view2
UIView *view3 = [[UIView alloc] initWithFrame:CGRectMake(60, 350, 200, 200)];
view3.backgroundColor = [UIColor yellowColor];
[_window addSubview:view3];
[view3 release];
UIView *view4 = [[UIView alloc] initWithFrame:CGRectMake(60, 350, 100, 100)];
view4.backgroundColor = [UIColor greenColor];
[_window addSubview:view4];
[view4 release];
//调整视图的层级关系
//调整是由父视图来完成，可以对所有的子视图进行调整
[_window bringSubviewToFront:view]; //把view[UIColor grayColor]（灰色）的这个调整到最上面。。。。。
//内存管理－－－－－－－添加1
[_window release];
return YES;
}
//这里是因为属性用retain或者copy －－－－－－－添加2
- (void)dealloc
{
[_window release];
[super dealloc];
}
- (void)applicationWillResignActive:(UIApplication *)application
{
// Sent when the application is about to 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
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