iOS零碎知识点

1、PCH文件

New File… —> Other —> PCH File —> PrefixHeader.pch

#import “Header.h”

PROJECT/TARGETS —> Build Settings —> Precompile Prefix Header(YES) —> Prefix Header($(SRCROOT/项目名/组名/PrefixHeader.pch))

2、UIApplication

UIApplication * application = [UIApplication sharedApplication]; //应用级别的配置

application.applicationIconBadgeNumber = 99;//程序图标的红色提醒字

application.networkActivityIndicatorVisible = YES; //联网指示器可见

//修改Info.plist View controller-based status bar(NO) 管理状态栏

[application setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];

[application setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];

// - (UIStatusBarStyle)preferredStatusBarStyle;

// - (BOOL)prefersStatusBarHidden;

(BOOL)openURL:(NSURL *)url;
[application openURL:[NSURL URLWithString:@“tel://10086”]];

//程序启动过程

a、main函数

b、UIApplicationMain

      ＊创建UIApplication对象

      ＊创建UIApplicationDelegate对象

      ＊进入消息循环队列

c、UIApplicationDelegate开始处理系统事件监听（no storyboard）

      ＊- (BOOL)application:didFinishLaunchingWithOptions:

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

      ＊ self.window.rootViewController = [[RootViewController alloc] init];

      ＊ [self.window makeKeyAndVisible];

c、根据Info.plist加载Main.storyboard（use storyboard）

     ＊- (BOOL)application:didFinishLaunchingWithOptions:

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

      ＊ self.window.rootViewController = [[RootViewController alloc] init];

      ＊ [self.window makeKeyAndVisible];

3、文件管理

NSFileManager *fileManager = [NSFileManager defaultManager];[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]; //Document

NSTemporaryDirectory(); //Temp