[xcode6.4,ios8.4]纯代码实现IOS显示的例子

[xcode6.4,ios8.4]纯代码实现IOS显示的例子

前面的例子，我们用Main.storyboard和代码来实现了简单的例子，这次我们将在Main.storyboard的视图中添加任何控件，而是直接通过代码来实现相同的功能。

先打开Xcode—Create a new Xcode project—Single View Application--输入项目名称，同时选择使用Objective-C语言，设备选择iPhone--接下来系统默认生成一个IOS项目模板。

在开始之前，我们先做些准备工作，将代码中需要使用到的一些方法做成一个工具类，方便调用。

 

 

 

这样，我们在项目下面就可以看到2个新生成的文件：Tool.h，Tool.m

 

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Tool.h

//
//  Tool.h
//  demo001
//
//  Created by zhoujianqiang on 15/8/29.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Tool : NSObject

@end

Tool.m

//
//  Tool.m
//  demo001
//
//  Created by zhoujianqiang on 15/8/29.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import "Tool.h"

@implementation Tool

@end

 接下来，修改Tool.h内容如下

Tool.h

//
//  Tool.h
//  demo001
//
//  Created by zhoujianqiang on 15/8/28.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface Tool : NSObject

#pragma mark 获取屏幕尺寸
+ (CGSize) loadScreenSize;
#pragma mark 创建一个文本输入框
+ (id) createTextField: (CGRect) rect withDelegate : (id) object withPlaceHold : (NSString*) placehold;
#pragma mark 创建一个按钮
+ (id) createButton: (CGRect) rect withDelegate : (id) object withAction : (SEL) sel withTitle : (NSString*) title;

@end

 修改Tool.m内容

Tool.m

//
//  Tool.m
//  demo001
//
//  Created by zhoujianqiang on 15/8/28.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import "Tool.h"

@implementation Tool


+ (CGSize) loadScreenSize{
    return [UIScreen mainScreen].bounds.size;
}


+ (id) createTextField: (CGRect) rect withDelegate : (id) object withPlaceHold : (NSString*) placehold{
    UITextField* field= [[UITextField alloc] initWithFrame:rect];
    field.placeholder=placehold;
    field.borderStyle=UITextBorderStyleRoundedRect;
    field.delegate=object;
    return field;
}

+ (id) createButton: (CGRect) rect withDelegate : (id) object withAction : (SEL) sel withTitle : (NSString*) title{
    UIButton* button = [[UIButton alloc] initWithFrame:rect];
    //设置标题颜色
    [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    //设置标题文字
    [button setTitle:title forState:UIControlStateNormal];
    //设置按钮操作
    [button addTarget:object action:sel forControlEvents:UIControlEventTouchUpInside];
    return button;
}

@end

修改 ViewController.h 内容

ViewController.h

//
//  ViewController.h
//  demo001
//
//  Created by zhoujianqiang on 15/8/28.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "Tool.h"

@interface ViewController : UIViewController <UITextFieldDelegate>

#pragma mark 手机号
@property (nonatomic,strong) UITextField *phoneNumber;
#pragma mark 密码
@property (nonatomic,strong) UITextField *password;
#pragma mark 登录按钮
@property (nonatomic,strong) UIButton *loginButton;

#pragma mark 登录按钮对应的点击事件
- (void) login : (UIButton*) btn;
@end

修改 ViewController.m 内容

ViewController.m

//
//  ViewController.m
//  demo001
//
//  Created by zhoujianqiang on 15/8/28.
//  Copyright (c) 2015年 zhoujianqiang. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //初始化视图
    [self initViews];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (void)initViews{
    
    //获取屏幕尺寸
    CGSize screenSize = [Tool loadScreenSize];
    int screenWidth = screenSize.width;
    int screenHeight = screenSize.height;
    
    NSLog(@"width=%d",screenWidth);
    NSLog(@"hieght=%d",screenHeight);
    
    //定义输入框与手机屏幕边的空隙
    int spanToBorder = 25;
    //定义输入框的宽度和高度
    int textFieldWidth = screenWidth-2*spanToBorder;
    int textFieldHeight = 30;
    //定义第一个输入框的y坐标
    int textFieldFirstY=320;
    //定义输入框之间高度间隔
    int spanToAnotherTextFieldForHeight = 20;
    //输入框个数索引
    int textFieldIndex = 0;
    
    
    //输入框y坐标
    int y =0;
    
    //添加手机号输入框
    textFieldIndex = 0;
    y =textFieldFirstY+spanToAnotherTextFieldForHeight*textFieldIndex;
    _phoneNumber=[Tool createTextField:CGRectMake(spanToBorder, y, textFieldWidth, textFieldHeight) withDelegate:self withPlaceHold:@"请输入手机号"];
    [self.view addSubview:_phoneNumber];
    
    //添加密码输入框
    textFieldIndex++;
    y =textFieldFirstY+(spanToAnotherTextFieldForHeight+textFieldHeight)*textFieldIndex;
    _password=[Tool createTextField:CGRectMake(spanToBorder, y, textFieldWidth, textFieldHeight) withDelegate:self withPlaceHold:@"请输入密码"];
    [self.view addSubview:_password];
    
    //添加登录按钮
    textFieldIndex++;
    y =textFieldFirstY+(spanToAnotherTextFieldForHeight+textFieldHeight)*textFieldIndex;
    _loginButton=[Tool createButton:CGRectMake(spanToBorder, y, textFieldWidth, textFieldHeight) withDelegate:self withAction:@selector(login:) withTitle:@"登录"];
    [self.view addSubview:_loginButton];

}

//UITextFieldDelegate method
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    
    [textField resignFirstResponder];
    
    return YES;
}

- (void) login : (UIButton*) btn{
    if ([_phoneNumber.text isEqual:@"123"] && [_password.text isEqual:@"456"]) {
        NSLog(@"登录成功！");
    }else{
        NSLog(@"登录失败...");
    }
}

@end

 OK，修改完毕，点击运行看看效果吧。