iOS开发篇——UITextField

官方UITextField

@interface UITextField : UIControl <UITextInput, NSCoding> 

@property(nonatomic,copy)   NSString               *text;                 // 文本         default is nil
@property(nonatomic,copy)   NSAttributedString     *attributedText NS_AVAILABLE_IOS(6_0); // default is nil
@property(nonatomic,retain) UIColor                *textColor;            // 文本颜色      default is nil. use opaque black
@property(nonatomic,retain) UIFont                 *font;                 // 文本字体      default is nil. use system font 12 pt
@property(nonatomic)        NSTextAlignment         textAlignment;        // 文本的排版    default is NSLeftTextAlignment
@property(nonatomic)        UITextBorderStyle       borderStyle;          // 边框的样式    default is UITextBorderStyleNone. If set to UITextBorderStyleRoundedRect, custom background images are ignored.
@property(nonatomic,copy)   NSDictionary           *defaultTextAttributes NS_AVAILABLE_IOS(7_0); //文本属性 用字典填充 applies attributes to the full range of text. Unset attributes act like default values.

@property(nonatomic,copy)   NSString               *placeholder;          // 文本填充      default is nil. string is drawn 70% gray
@property(nonatomic,copy)   NSAttributedString     *attributedPlaceholder NS_AVAILABLE_IOS(6_0); // default is nil
@property(nonatomic)        BOOL                    clearsOnBeginEditing; // 开始编辑的时候清空  default is NO which moves cursor to location clicked. if YES, all text cleared
@property(nonatomic)        BOOL                    adjustsFontSizeToFitWidth; //自适应文本到宽度 default is NO. if YES, text will shrink to minFontSize along baseline
@property(nonatomic)        CGFloat                 minimumFontSize;      //最小的文本大小 default is 0.0. actual min may be pinned to something readable. used if adjustsFontSizeToFitWidth is YES
@property(nonatomic,assign) id<UITextFieldDelegate> delegate;             // 协议         default is nil. weak reference
@property(nonatomic,retain) UIImage                *background;           // 背景         default is nil. draw in border rect. image should be stretchable
@property(nonatomic,retain) UIImage                *disabledBackground;   // 禁用的背景    default is nil. ignored if background not set. image should be stretchable

@property(nonatomic,readonly,getter=isEditing) BOOL editing;              //是否被编辑
@property(nonatomic) BOOL allowsEditingTextAttributes NS_AVAILABLE_IOS(6_0); // default is NO. allows editing text attributes with style operations and pasting rich text
@property(nonatomic,copy) NSDictionary *typingAttributes NS_AVAILABLE_IOS(6_0); // automatically resets when the selection changes

// You can supply custom views which are displayed at the left or right
// sides of the text field. Uses for such views could be to show an icon or
// a button to operate on the text in the field in an application-defined
// manner.
// 
// A very common use is to display a clear button on the right side of the
// text field, and a standard clear button is provided. Note: if the clear
// button overlaps one of the other views, the clear button will be given
// precedence.

@property(nonatomic)        UITextFieldViewMode  clearButtonMode; // sets when the clear button shows up. default is UITextFieldViewModeNever

@property(nonatomic,retain) UIView              *leftView;        // e.g. magnifying glass
@property(nonatomic)        UITextFieldViewMode  leftViewMode;    // sets when the left view shows up. default is UITextFieldViewModeNever

@property(nonatomic,retain) UIView              *rightView;       // e.g. bookmarks button
@property(nonatomic)        UITextFieldViewMode  rightViewMode;   // sets when the right view shows up. default is UITextFieldViewModeNever

// drawing and positioning overrides

- (CGRect)borderRectForBounds:(CGRect)bounds;
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)placeholderRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
- (CGRect)leftViewRectForBounds:(CGRect)bounds;
- (CGRect)rightViewRectForBounds:(CGRect)bounds;

- (void)drawTextInRect:(CGRect)rect;
- (void)drawPlaceholderInRect:(CGRect)rect;

// Presented when object becomes first responder.  If set to nil, reverts to following responder chain.  If
// set while first responder, will not take effect until reloadInputViews is called.
@property (readwrite, retain) UIView *inputView;             //键盘的view
@property (readwrite, retain) UIView *inputAccessoryView;    //想在键盘上展示一个自定义的view时，你就可以设置该属性

@property(nonatomic) BOOL clearsOnInsertion NS_AVAILABLE_IOS(6_0); // defaults to NO. if YES, the selection UI is hidden, and inserting text will replace the contents of the field. changing the selection will automatically set this to NO.

@end

基本使用：

UITextField *textField = [[UITextField alloc]initWithFrame:CGRectMake(100, 100, 200, 50)];
textField.tag = 10;
textField.borderStyle = UITextBorderStyleRoundedRect;//

#pragma mark - 关于文本的设置
-(void)textSetting
{
    //找到文本输入框
    UITextField *textField = (id)[self.view viewWithTag:10];
    //设置文字
//    textField.text = @"我是文本框";
    //设置文字颜色
    textField.textColor = [UIColor redColor];
    //设置文字字体
    textField.font = [UIFont boldSystemFontOfSize:25];
    //设置文字对齐方式，默认居左
    textField.textAlignment = NSTextAlignmentRight;
    /**
     NSTextAlignmentLeft
     NSTextAlignmentRight
     NSTextAlignmentCenter
     */
    //设置文字自适应宽度
    textField.adjustsFontSizeToFitWidth = YES;
    //设置允许的最小字体，在adjustsFontSizeToFitWidth = YES，才有效
    textField.minimumFontSize = 17;
    
    //设置提示文字
    textField.placeholder = @"请输入用户名";
    //设置是否使用密文输入
//    textField.secureTextEntry = YES;
    
    //设置开始编辑时，清除已有的文字
    textField.clearsOnBeginEditing = YES;
}

#pragma mark - 关于样式的设置

-(void)styleSetting
{
    //找到已经创建好的UITextField
    UITextField *textField = (UITextField *)[self.view viewWithTag:10];
    //设置背景颜色
//    textField.backgroundColor = [UIColor cyanColor];
    //设置边框样式
    textField.borderStyle = UITextBorderStyleNone;
    /**
     UITextBorderStyleNone
     无边框
     UITextBorderStyleLine
     线性矩形
     UITextBorderStyleBezel
     尖角矩形
     UITextBorderStyleRoundedRect
     圆角矩形
     */
    //通过layer设置圆角
    textField.layer.cornerRadius = 10;
    textField.layer.borderColor = [UIColor lightGrayColor].CGColor;
    textField.layer.borderWidth = 1;
    
    //设置是否显示清除按钮
    textField.clearButtonMode = UITextFieldViewModeUnlessEditing;
    //显示清除按钮的前提都是要有文字
    /**
     UITextFieldViewModeNever,
     //从不显示
     UITextFieldViewModeWhileEditing,
     //编辑时显示
     UITextFieldViewModeUnlessEditing,
     //非编辑时显示
     UITextFieldViewModeAlways
     //一直显示
     */
    
    //成为第一响应者
    //第一响应者，一个界面可能有多个可输入的控件，哪一个正在编辑哪一个就是第一响应者
    [textField becomeFirstResponder];
    
    //设置背景图片
    textField.background = [UIImage imageNamed:@"1.png"];
    //设置不可编辑时的背景图
    textField.disabledBackground = [UIImage imageNamed:@"5.png"];
    //设置是否可以编辑,YES 可以编辑，NO不可以
//    textField.enabled = NO;
    UIView *leftView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];
    leftView.backgroundColor = [UIColor magentaColor];
    //设置左视图,所有直接或间接继承于UIView的类的对象，都可以作为左视图
    textField.leftView = leftView;
    //设置左视图的显示模式
    textField.leftViewMode = UITextFieldViewModeAlways;
    
    UIView *rightView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 50, 50)];
    rightView.backgroundColor = [UIColor yellowColor];
    //设置右视图
    textField.rightView = rightView;
    //设置右视图的显示模式
    textField.rightViewMode = UITextFieldViewModeAlways;
}

自定制输入键盘

创建一个协议：

@protocol KeyBoardViewDelegate <NSObject>


-(void)inputText:(NSString *)text;

@end

创建View

@interface KeyBoardView : UIView

@property(nonatomic, assign) id <KeyBoardViewDelegate> delegate;

@end

@implementation KeyBoardView

-(instancetype)init
{
    self = [super init];
    if (self) {
        CGSize size = [UIScreen mainScreen].bounds.size;
        self.frame = CGRectMake(0, 0, size.width, 258);
        [self createButtons];
    }
    return self;
    
}

-(void)createButtons
{
    NSArray *array = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0",@"+",@"-"];
    int i = 0;
    for (NSString *title in  array)
    {
        //遍历标题，创建按钮
        UIButton *button = [[UIButton alloc]init];
        button.backgroundColor = [UIColor lightGrayColor];
        button.frame = CGRectMake(10 + (i % 3) * 90, 10 + (i / 3) * 50, 85, 45);
        [button setTitle:title forState:UIControlStateNormal];
        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        button.titleLabel.font = [UIFont boldSystemFontOfSize:30];
        [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:button];
        i++;
    }
}

-(void)buttonClicked:(UIButton *)sender
{
    //代理存在，且能响应inputText:这个方法
    if(_delegate && [_delegate respondsToSelector:@selector(inputText:)])
    {
        [_delegate inputText:sender.titleLabel.text];
    }
}
@end