iOS个人整理04-UITextField文本输入框

UITextField--文本框

UITextField是控制文本输入和显示的控件，只能输入单行

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];

#pragma mark UITextField文本框,单行

//初始化
UITextField *myTextField = [[UITextField alloc]initWithFrame:CGRectMake(100, 350, 150, 20)];

 //占位字符,没有输入时显示的文本，点击文本框时自动清空
myTextField.placeholder = @"请输入手机号";

    //设置键盘样式，数字键盘，字母键盘等
myTextField.keyboardType = UIKeyboardTypeNumberPad;

myTextField.returnKeyType = UIReturnKeySend; //设置键盘上的return键
 

//设置边框样式
myTextField.borderStyle = UITextBorderStyleRoundedRect;
//设置密码样式，使输入内容隐藏
myTextField.secureTextEntry = NO;
[self.window addSubview:Line];
//设置右侧小叉号，点击可以删去所有输入内容
myTextField.clearButtonMode = UITextFieldViewModeAlways;
//设置首字母大写
myTextField.autocapitalizationType = UITextAutocapitalizationTypeWords;
//通过属性控制是否可以编辑
myTextField.enabled = YES;
//自定义键盘
UIView *keyBoardView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.window.frame), 256)];
//定义一个button放在键盘上
UIButton *firstButton = [UIButton buttonWithType:UIButtonTypeSystem];
[firstButton setTitle:@"1" forState:UIControlStateNormal];
firstButton.frame = CGRectMake(10, 10, 50, 50);
[keyBoardView addSubview:firstButton];
firstButton.backgroundColor = [UIColor whiteColor];
//设置点击效果
[firstButton addTarget:self action:@selector(keyButton:) forControlEvents:UIControlEventTouchUpInside];
myTextField.inputView = keyBoardView; //显示 [self.window addSubview:myTextField];
//新建一个输入框，设置代理方法
UITextField *delegateTextField = [[UITextField alloc]initWithFrame:CGRectMake(10, 200, 100, 100)];
delegateTextField.borderStyle = UITextBorderStyleLine;
delegateTextField.placeholder = @"代理方法";
delegateTextField.keyboardType = UIKeyboardTypeDefault;
//设置代理方法，代理人是本类 delegateTextField.delegate = self;
[self.window addSubview:delegateTextField]; return YES;}
//自定义按钮的-(void)keyButton:(UIButton*)sender{ sender.selected = !sender.selected;
UITextField *field = (UITextField*)[self.window viewWithTag:1001];
NSString *title = [sender titleForState:UIControlStateNormal];
field.text = [field.text stringByAppendingString:title];
//回收键盘 取消第一响应者 结束编辑状态 [field resignFirstResponder];
//另一种方法回收键盘 //[self.view endEditing YES];
//变为第一响应者 [field becomeFirstResponder]; }
#pragma makr 代理方法
//是否可以开始编辑状态
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
NSLog(@"%s",__func__);
return YES;}
//已经进入编辑状态
-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(@"%s",__func__);
}
//是否可以结束编辑
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{
NSLog(@"%s",__func__);
return YES;}
//已经结束编辑状态
-(void)textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"%s",__func__);
}
//点击右下角return按钮所触发的代理方法
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
NSLog(@"return");
//在此回收键盘
[textField resignFirstResponder];
return YES;}
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
//可以限制文字的改变
return YES;
}

设置了代理方法后，UITextField的各种状态会触发代理方法，在本例中代理人设置成了self，也就是本类，然后在本类中实习代理协议要求的方法，这些方法都是@optional的，可以选择性实现