IOS开发之UIColor的设置

摘要: IOS开发之UIColor的设置

IOS开发之UIColor的设置#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {//创建window_window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];//设置背景颜色_window.backgroundColor = [UIColor yellowColor];//=========创建view=============//1.创建一个UIView对象UIView *view = [[UIView alloc]initWithFrame:CGRectMake(60,60, 200, 100)];//2.添加到界面上[_window addSubview:view];//3.设置背景色（默认是透明色）//通过类方法去直接创建对应的颜色[view setBackgroundColor:[UIColor yellowColor]];//R-G-B:0-1;//alpha是透明度:0是全透明，1是不透明view.backgroundColor = [UIColor colorWithRed:48/255.0f green:100/255.0fblue:150/255.0f alpha:1];//设置随意颜色view.backgroundColor = [UIColor colorWithRed:arc4random() % 256 /255.0f green:arc4random() % 256 /255.0f blue:arc4random() % 256 /255.0f alpha:1];//=============================//成为主窗口并且显示[_window makeKeyAndVisible];return YES;}- (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