Ios learning Summary (1), ios learning Summary

Ios learning Summary (1), ios learning Summary

Original article address

Download and open xcode.

Create a new project, as shown in:

Click Create a new Xcode project, select Application under ios, and click Single View Application to Create our first project. :

After creating a project, we will compile our first ios project.

Find the AppDelegate. m file and add it under "# import" AppDelegate. h:

#import "ViewController.h"

Then add the following code to the didfinishlaunchingwitexceptions function:

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];self.window.rootViewController = [[ViewController alloc]init];[self.window makeKeyAndVisible];

The overall structure is shown in:

Next, open ViewController. m and add the following in the viewDidLoad function:

UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];[btn setBackgroundColor:[UIColor redColor]];[btn addTarget:self action:@selector(clickAction) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 20)];label.text = @"hello world";[self.view addSubview:label];

Then add the function:

- (void)clickAction{ NSLog(@"Clicked!");}

Shows the overall effect:

Click the run icon, as shown in:

The effect after running is as follows:

When you click the red button, Xcode prints the following information:

So far, our first app has been completed.