iOS开篇——UI之UITextField

创建文本输入框

    UITextField * textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 50, 250, 40)];

设置边框样式

    textField.borderStyle = UITextBorderStyleRoundedRect;/*typedef NS_ENUM(NSInteger, UITextBorderStyle) {UITextBorderStyleNone, 无效果UITextBorderStyleLine, 线性边框 有阴影UITextBorderStyleBezel,UITextBorderStyleRoundedRect 圆角矩形};*/

设置text相关

    textField.text = @"2002年的第一场雪";//设置字体相关textField.font = [UIFont systemFontOfSize:20];textField.textColor = [UIColor greenColor];//设置自适应textField.adjustsFontSizeToFitWidth = YES;//设置居中
//    textField.textAlignment = NSTextAlignmentCenter;

设置提示语

    //设置提示语textField.placeholder = @"请输入";//设置是否清除 开始编辑时
//    textField.clearsOnBeginEditing = YES;

设置/取消第一响应者

    //点击输入框 让输入框成为了第一响应者//所谓第一响应者  就是即将编辑的控件  要操作触摸的控件
    [textField becomeFirstResponder];//取消成为第一响应者[textField resignFirstResponder];

交互是否开启

    //取消交互是否开启textField.userInteractionEnabled = YES;

设置清除按钮

    //设置清除按钮textField.clearButtonMode = UITextFieldViewModeAlways;/*typedef NS_ENUM(NSInteger, UITextFieldViewMode) {UITextFieldViewModeNever,  从不UITextFieldViewModeWhileEditing,  编辑时UITextFieldViewModeUnlessEditing,  不编辑时显示UITextFieldViewModeAlways  一直显示};*/

设置左右两侧view

    //**********同一个view不能同时设置为左右图片
//    左侧viewUIView * view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];view.backgroundColor = [UIColor blueColor];textField.leftView = view;textField.leftViewMode = UITextFieldViewModeAlways;
//    右侧viewUIView * view1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];textField.rightView = view1;view1.backgroundColor = [UIColor greenColor];
//    textField.rightViewMode = UITextFieldViewModeAlways ;

设置键盘样式

//设置键盘样式textField.keyboardType = UIKeyboardTypeDefault;/*typedef NS_ENUM(NSInteger, UIKeyboardType) {UIKeyboardTypeDefault,                // Default type for the current input method.UIKeyboardTypeASCIICapable,           // Displays a keyboard which can enter ASCII characters, non-ASCII keyboards remain activeUIKeyboardTypeNumbersAndPunctuation,  // Numbers and assorted punctuation.UIKeyboardTypeURL,                    // A type optimized for URL entry (shows . / .com prominently).UIKeyboardTypeNumberPad,              // A number pad (0-9). Suitable for PIN entry.UIKeyboardTypePhonePad,               // A phone pad (1-9, *, 0, #, with letters under the numbers).UIKeyboardTypeNamePhonePad,           // A type optimized for entering a person's name or phone number.UIKeyboardTypeEmailAddress,           // A type optimized for multiple email address entry (shows space @ . prominently).UIKeyboardTypeDecimalPad NS_ENUM_AVAILABLE_IOS(4_1),   // A number pad with a decimal point.UIKeyboardTypeTwitter NS_ENUM_AVAILABLE_IOS(5_0),      // A type optimized for twitter text entry (easy access to @ #)UIKeyboardTypeWebSearch NS_ENUM_AVAILABLE_IOS(7_0),    // A default keyboard type with URL-oriented addition (shows space . prominently).UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, // Deprecated};*/textField.returnKeyType =UIReturnKeyDone;/*typedef NS_ENUM(NSInteger, UIReturnKeyType) {UIReturnKeyDefault,UIReturnKeyGo,UIReturnKeyGoogle,UIReturnKeyJoin,UIReturnKeyNext,UIReturnKeyRoute,UIReturnKeySearch,UIReturnKeySend,UIReturnKeyYahoo,UIReturnKeyDone,UIReturnKeyEmergencyCall,UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),};*/

触摸屏幕  取消第一响应者 退出编辑

//触摸屏幕 调用此方法
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{UITextField * textField = (id)[self.view viewWithTag:1];[textField resignFirstResponder];
//    [self.view becomeFirstResponder];
}

实现UITextFieldDelegate代理方法

#pragma mark - UITextFieldDelegate//是否可以开始编辑
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{return YES;
}// return NO to disallow editing.//已经开始编辑
- (void)textFieldDidBeginEditing:(UITextField *)textField{NSLog(@"已经开始编辑");
}// became first responder//是否可以结束编辑 yes可以  no不可以
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{return YES;
}// return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end//已经结束编辑
- (void)textFieldDidEndEditing:(UITextField *)textField{//可在此进行保存草稿NSLog(@"已经结束编辑");
}// may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{return YES;
}// return NO to not change text//触发此方法 返回可否清除
- (BOOL)textFieldShouldClear:(UITextField *)textField{return NO;
}// called when clear button pressed. return NO to ignore (no notifications)- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{}
//点击键盘上的return 执行此方法
- (BOOL)textFieldShouldReturn:(UITextField *)textField{return  YES;
}// called when 'return' key pressed. return NO to ignore.

转载于:https://www.cnblogs.com/gwkiOS/p/4990259.html

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