UI_02 基础视图、程序启动流程

标签：

?、UITextField

UITextField（输?框）：是控制?本输?和显?的控件

UITextField核?功能主要包含3个??： ?本显? 输?控制 外观配置

1、?本显?

//    textField.text = @"你好";

//    textField.textAlignment = NSTextAlignmentCenter;

    textField.textColor = [UIColor blueColor];

    textField.placeholder = @"请输入我爱编程";

    textField.font = [UIFont fontWithName:@"" size:20];

2、输?控制

    textField.enabled = YES;
    textField.clearsOnBeginEditing = NO;
    textField.secureTextEntry = YES;
    textField.keyboardType = UIKeyboardTypeDefault;

    textField.returnKeyType = UIReturnKeyDefault;

//自定义键盘视图
    UIView * inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 180)];
    inputView.backgroundColor = [UIColor blueColor];
    textField.inputView = inputView;
    [inputView release];
//自定义键盘辅助视图
    UIView * inputAccessaryView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 60)];
    inputAccessaryView.backgroundColor = [UIColor yellowColor];
    textField.inputAccessoryView = inputAccessaryView;

    [inputAccessaryView release];

3、外观控制

    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;

    //设置文本框左视图

    UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];

    button.frame = CGRectMake(0, 0, 40, 40);

    [button setBackgroundImage:[UIImage imageNamed:@"face_monkey_2_24px_541648_easyicon.net.png"] forState:UIControlStateNormal];

    textField.leftView = button;

    textField.leftViewMode = UITextFieldViewModeAlways;

二、UIButton

    UIButton * button = [UIButton buttonWithType:UIButtonTypeSystem];
//    button.backgroundColor = [UIColor blackColor];
    button.frame = CGRectMake(30, 100, 50, 50);
//    button.layer.cornerRadius = 20;
    //设置前景图片
    [button setImage:[UIImage imageNamed:@"" ] forState:UIControlStateNormal];
    //设置背景图片
    //设置普通状态下的背景图片
    [button setBackgroundImage:[UIImage imageNamed:@"normal.png"] forState:UIControlStateNormal];
    //设置高亮状态下的背景图片
    [button setBackgroundImage:[UIImage imageNamed:@"hilighted.png"] forState:UIControlStateHighlighted];
    //添加事件
    [button addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];
    //设置按钮title
    [button setTitle:@"绿鸟" forState:UIControlStateNormal];
    [button setTitle:@"蓝鸟" forState:UIControlStateHighlighted];

    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

- (void)clickButton:(UIButton *)button
{
    self.window.backgroundColor = [UIColor colorWithRed:random()%100/100.0 green:random()%100/100.0 blue:random()%100/100.0 alpha:1];
    button.backgroundColor = [UIColor whiteColor];

}

三、AppDelegate

＊＊＊＊键盘收回＊＊＊＊

1、将AppDelegate作为UITextField的delegate

@interface AppDelegate : UIResponder <UIApplicationDelegate, UITextFieldDelegate>

2、AppDelegate.m?件实现textFieldShouldReturn:?法

- (void)textFieldDidBeginEditing:(UITextField *)textField

{
    [textField becomeFirstResponder];
    NSLog(@"%s", __FUNCTION__);

}// became first responder

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{

    NSLog(@"%s", __FUNCTION__);     // 输出方法名

    [textField resignFirstResponder];
    return YES;

}// called when ‘return‘ key pressed. return NO to ignore.

3、添加代理

    textField.delegate = self;

＊＊＊＊触摸键盘外空白区域隐藏键盘＊＊＊＊

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{
    UITouch *touch = [touches anyObject];
   
    if (![touch.view isKindOfClass: [UITextField class]] || ![touch.view isKindOfClass: [UITextView class]]) {
       

        [self.window endEditing:YES];       

    }

    [super touchesBegan:touches withEvent:event];

}

四、iOS程序启动流程

1、程序入口

int main(int argc, char * argv[]) {

    @autoreleasepool {

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }

}

UIApplicationMain剖析:

    argc: argv[].count

    argv[]: 存放的是所有的参数

    principalClassName:如果是nil，UIApplicationMain()函数会给系统创建一个UIApplication这个类的一个对象，而且是唯一的，叫做应用程序对象

    delegateClassName:UIApplicationMain()使用给定类创建代理并给应用程序设置代理

    UIApplicationMain()这个函数，开启事件循环

2、UIApplicationDelegate

UIApplicationDelegate是?个OC的协议。??声明了?堆?法，这些? 法都与应?程序运?状态有关，它们由应?程序代理实现。UIApplication 对象负责调?。

iOS生命周期：

程序启动：

application:didFinishLaunchingWithOptions:

applicationDidBecomeActive:

挂起：

applicationWillResignActive:     （tag:按两下Home键只发送此消息）

applicationDidEnterBackground:

恢复：

applicationWillEnterForeground:

applicationDidBecomeActive:     （tag:从此状态返回程序只发送此消息）

结束：

applicationWillResignActive:   

applicationDidEnterBackground:

AppDelegate applicationWillTerminate:

输出函数名：

    NSLog(@"%s", __FUNCTION__);

UI_02 基础视图、程序启动流程

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原文地址：http://my.oschina.net/zooyf/blog/493650