从0开发一款IOS APP

源码：

https://github.com/geektime-geekbang/geektime-ios-course

我的Github：

https://github.com/zx490336534/SampleApp

欢迎关注我的公众号：zx94_11

创建第一个Xcode工程

创建1

创建2

创建3

Hello world

viewController.m文件：

复制
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.view addSubview:({
        UILabel *label = [[UILabel alloc] init];
        label.text = @"hello wolrd";
        [label sizeToFit];
    label.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
    label;
})];
}
@end

Hello World

创建一个坐标宽高都为100的红色方块

复制
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *view = [[UIView alloc] init];
    view.backgroundColor = [UIColor redColor];
    view.frame = CGRectMake(100, 100, 100, 100);
    [self.view addSubview:view];
}
@end

红色方框

创建一个有重叠的绿色方块

复制
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *view = [[UIView alloc] init];
    view.backgroundColor = [UIColor redColor];
    view.frame = CGRectMake(100, 100, 100, 100);
    [self.view addSubview:view];
    UIView *view2 = [[UIView alloc] init];
    view2.backgroundColor = [UIColor greenColor];
    view2.frame = CGRectMake(150, 150, 100, 100);
    [self.view addSubview:view2];
}
@end

view2在view之后创建，所以view2在view上方

绿色方块

UIview的生命周期

创建一个自己的TestView，继承于UIView

复制
@interface TestView : UIView // 创建一个自己的TestView，继承于UIView
@end
@implementation TestView
- (instancetype)init{
    self = [super init];
    if (self) {
    }
    return self;
}
- (void)willMoveToSuperview:(nullable UIView *)newSuperview{
    [super willMoveToSuperview:newSuperview];
}
- (void)didMoveToSuperview{
    [super didMoveToSuperview];
}
- (void)willMoveToWindow:(nullable UIWindow *)newWindow{
    [super willMoveToWindow:newWindow];
}
- (void)didMoveToWindow{
    [super didMoveToWindow];
}
@end

断点调试

断点调试

实例化的时候使用TestView：TestView *view2 = [[TestView alloc] init];

ViewController的生命周期

• init
• viewDidLoad
• viewWillAppear
• viewDidAppear
• viewWillDisappear
• viewDidDisappear
• Dealloc

实现TabBar页面

AppDelegate.m文件：

复制
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 // Override point for customization after application launch. 
 self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
 UITabBarController *tabbarController = [[UITabBarController alloc] init];
 UIViewController *controller1 =[[UIViewController alloc]init];
 controller1.view.backgroundColor = [UIColor redColor];
 UIViewController *controller2 =[[UIViewController alloc]init];
 controller2.view.backgroundColor = [UIColor yellowColor];
 UIViewController *controller3 =[[UIViewController alloc]init];
 controller3.view.backgroundColor = [UIColor greenColor];
 UIViewController *controller4 =[[UIViewController alloc]init];
 controller4.view.backgroundColor = [UIColor lightGrayColor];
 [tabbarController setViewControllers:@[controller1,controller2,controller3,controller4]];
 self.window.rootViewController = tabbarController;
 [self.window makeKeyAndVisible];
 return YES;
}

点击不同位置颜色不同

TabBar

增加标题

复制
UIViewController *controller1 =[[UIViewController alloc]init];
controller1.view.backgroundColor = [UIColor redColor];
controller1.tabBarItem.title=@"新闻";
UIViewController *controller2 =[[UIViewController alloc]init];
controller2.view.backgroundColor = [UIColor yellowColor];
controller2.tabBarItem.title=@"视频";
UIViewController *controller3 =[[UIViewController alloc]init];
controller3.view.backgroundColor = [UIColor greenColor];
controller3.tabBarItem.title=@"推荐";
UIViewController *controller4 =[[UIViewController alloc]init];
controller4.view.backgroundColor = [UIColor lightGrayColor];
controller4.tabBarItem.title=@"我的";

增加标题

增加图片

复制
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 // Override point for customization after application launch. 
 self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
 UITabBarController *tabbarController = [[UITabBarController alloc] init];
 UIViewController *controller1 =[[UIViewController alloc]init];
 controller1.view.backgroundColor = [UIColor redColor];
 controller1.tabBarItem.title=@"新闻";
 controller1.tabBarItem.image = [UIImage imageNamed:@"icon.bundle/page@2x.png"];
 controller1.tabBarItem.selectedImage = [UIImage imageNamed:@"ico.bundle/page_selected@2x.png"];
 UIViewController *controller2 =[[UIViewController alloc]init];
 controller2.view.backgroundColor = [UIColor yellowColor];
 controller2.tabBarItem.title=@"视频";
 controller2.tabBarItem.image = [UIImage imageNamed:@"icon.bundle/video@2x.png"];
 controller2.tabBarItem.selectedImage = [UIImage imageNamed:@"ico.bundle/video_selected@2x.png"];
 UIViewController *controller3 =[[UIViewController alloc]init];
 controller3.view.backgroundColor = [UIColor greenColor];
 controller3.tabBarItem.title=@"推荐";
 controller3.tabBarItem.image = [UIImage imageNamed:@"icon.bundle/like@2x.png"];
 controller3.tabBarItem.selectedImage = [UIImage imageNamed:@"ico.bundle/like_selected@2x.png"];
 UIViewController *controller4 =[[UIViewController alloc]init];
 controller4.view.backgroundColor = [UIColor lightGrayColor];
 controller4.tabBarItem.title=@"我的";
 controller4.tabBarItem.image = [UIImage imageNamed:@"icon.bundle/home@2x.png"];
 controller4.tabBarItem.selectedImage = [UIImage imageNamed:@"ico.bundle/home_selected@2x.png"];
 [tabbarController setViewControllers:@[controller1,controller2,controller3,controller4]];
 self.window.rootViewController = tabbarController;
 [self.window makeKeyAndVisible];
 return YES;
}

Tab图片