UITextField用法

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#import"AppDelegate.h"

UITextField:是UIControl的子类,是文本输入框

⭐️⭐️⭐️⭐️属性⭐️⭐️⭐️⭐️

text：可以获得或改变输入框的文字内容

placeholder：提示文字如请输入账号

textColor：

font：

textAlignment：

adjustsFontSizeToFitWidth:让文字自动根据宽度适配

minimumFontSize：设置文字最小字号

❤️❤️❤️delegate：代理❤️❤️❤️

clearButtonMode：设置清除按钮的显示时间

UITextFieldViewModeNever:永远都不显示

UITextFieldViewModeWhileEditing：当编辑时显示

UITextFieldViewModeUnlessEditing：不再编辑时显示

UITextFieldViewModeAlways：永远显示

leftView：输入框左侧视图

rightView：输入框右侧视图

❤️❤️不是设置了左右侧视图就可以显示，需要配合使用以下属性❤️❤️

leftViewMode：设置什么情况下显示左侧视图的

rightViewMode：设置什么情况下显示右侧视图的

keyboardType：键盘的样式

UIKeyboardTypeDefault

UIKeyboardTypeASCIICapable UIKeyboardTypeNumbersAndPunctuation :数字和符号

UIKeyboardTypeURL：URL网址类型

下面三条iPad专用

UIKeyboardTypeNumberPad：只显示 0 - 9的数字 UIKeyboardTypePhonePad：电话类型（1-9，*，0，#）

UIKeyboardTypeNamePhonePad：

UIKeyboardTypeEmailAddress：邮箱地址类型

UIKeyboardTypeDecimalPadNS_ENUM_AVAILABLE_IOS(4_1), UIKeyboardTypeTwitterNS_ENUM_AVAILABLE_IOS(5_0),

UIKeyboardTypeWebSearch NS_ENUM_AVAILABLE_IOS(7_0)：网页搜索，小地球的样式

UIKeyboardTypeAlphabet= UIKeyboardTypeASCIICapable,

inputView:键盘上面的视图

inputAccessoryView:键盘区域的视图

borderStyle:输入框的样式

UITextBorderStyleNone

UITextBorderStyleLine：黑线边框

UITextBorderStyleBezel：黑线阴影

UITextBorderStyleRoundedRect：圆角

输入框的方法（代理方法自动调用）：

开始编辑时调用

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.

-(void)textFieldDidBeginEditing:(UITextField *)textField; // became first responder

结束编辑时调用

-(BOOL)textFieldShouldEndEditing:(UITextField *)textField; // return YES to allow editing to stop and to resign firstresponder status. NO to disallow the editing session to end

-(void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditingreturns NO (e.g. view removed from window) or endEditing:YES called

文字内容改变时调用此方法

-(BOOL)textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string; // return NO to not change text

点击清除按钮时调用

-(BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO toignore (no notifications)

点击return键时调用

-(BOOL)textFieldShouldReturn:(UITextField *)textField; // called when 'return' key pressed. return NO toignore.

专门为输入框准备的响应事件

UIControlEventEditingDidBegin = 1 << 16, //UITextField

UIControlEventEditingChanged = 1 << 17,

UIControlEventEditingDidEnd = 1 << 18,

UIControlEventEditingDidEndOnExit = 1 << 19, // 'return key'ending editing

注意：1.如果想使用代理方法，必须先导入代理

2.如果代理方法没有触发，看是否挂上了代理

3.使用左右侧视图时要配合左右侧视图样式使用

leftView：输入框左侧视图

rightView：输入框右侧视图

❤️❤️不是设置了左右侧视图就可以显示，需要配合使用以下属性❤️❤️

leftViewMode：设置什么情况下显示左侧视图的

rightViewMode：设置什么情况下显示右侧视图的

//1.导入代理的名字

//2.挂上代理，没触发代理方法表示没有挂上代理

//3.实现代理的方法

@interfaceAppDelegate ()<UITextFieldDelegate>//❤️❤️<UITextFieldDelegate>1.导入代理的名字❤️❤️

@end

@implementationAppDelegate

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {

[self.windowmakeKeyAndVisible];

UITextField *accTextField = [[UITextFieldalloc]initWithFrame:CGRectMake(10,40, CGRectGetWidth([UIScreenmainScreen].bounds)-20,40)];

// accTextField.backgroundColor = [UIColor cyanColor];

// 提示文字

accTextField.placeholder =@"请输入账号";

//设置输入框的样式

accTextField.borderStyle =UITextBorderStyleBezel;

// 清除按钮,具有一键清除输入框中内容的功能

accTextField.clearButtonMode =UITextFieldViewModeWhileEditing;

UIImageView *leftImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0, 30, 30)];

// 可直接向图片视图中添加图片

leftImageView.image = [UIImageimageNamed:@"play48.png"];

// 在输入框左侧设置视图

accTextField.leftView = leftImageView;

accTextField.leftViewMode =UITextFieldViewModeAlways;

// 键盘的样式

accTextField.keyboardType =UIKeyboardTypeNumbersAndPunctuation;

UIView *inputV = [[UIView alloc]initWithFrame:CGRectMake(0,0, CGRectGetWidth([UIScreenmainScreen].bounds),40)];

inputV.backgroundColor = [UIColorgreenColor];

// 输入时弹出inputV框

// accTextField.inputView = inputV;

accTextField.inputAccessoryView = inputV;

// ❤️❤️2.想使用代理方法，必须挂上代理❤️❤️

accTextField.delegate =self;//⭐️⭐️⭐️很重要⭐️⭐️⭐️

[self.windowaddSubview:leftImageView];

[self.windowaddSubview:accTextField];

return YES;

}

//-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField; // return NO to disallow editing.

//-(void)textFieldDidBeginEditing:(UITextField *)textField; // became first responder

//-(BOOL)textFieldShouldEndEditing:(UITextField *)textField; // return YES to allow editing to stop and to resign firstresponder status. NO to disallow the editing session to end

//-(void)textFieldDidEndEditing:(UITextField *)textField; // may be called if forced even if shouldEndEditingreturns NO (e.g. view removed from window) or endEditing:YES called

//-(BOOL)textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string; // return NO to not change text

//-(BOOL)textFieldShouldClear:(UITextField *)textField; // called when clear button pressed. return NO toignore (no notifications)

- (void)textFieldDidBeginEditing:(UITextField *)textField{

NSLog(@"开始编辑");

}

//当点击模拟器键盘上的 return键时自动触发

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

// 回收键盘,标志着输入结束

[textField resignFirstResponder];

return YES;

}

//编辑结束的时候调用，return和回车都可调用

- (void)textFieldDidEndEditing:(UITextField *)textField{

// 此属性可以获得输入框的内容

NSLog(@"%@",textField.text);

}

//编辑结束的时候调用，与上面方法等价

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

// 此属性可以获得输入框的内容

NSLog(@"%@",textField.text);

return YES;

}

//点击清除按钮时调用

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

NSLog(@"点清除按钮时");

return YES;

}

//可以获得用户每输入一次的文字及其位置

- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)rangereplacementString:(NSString *)string{

NSLog(@"%@",string);

return YES;

}

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