IOS_改变UITextField placeHolder颜色、字体


咱们有时须要定制化UITextField对象的风格,能够添加许多不一样的重写方法,来改变文本字段的显示行为。这些方法都会返回一个CGRect结构,制定了文本字段每一个部件的边界范围,甚至修改placeHolder颜色,字体。函数


– textRectForBounds:      //重写来重置文字区域字体

– drawTextInRect:         //改变绘文字属性.重写时调用super能够按默认图形属性绘制,若本身彻底重写绘制函数,就不用调用super.spa

– placeholderRectForBounds:  //重写来重置占位符区域code

– drawPlaceholderInRect:  //重写改变绘制占位符属性.重写时调用super能够按默认图形属性绘制,若本身彻底重写绘制函数,就不用调用superorm

– borderRectForBounds:  //重写来重置边缘区域对象

– editingRectForBounds:  //重写来重置编辑区域继承

– clearButtonRectForBounds:  //重写来重置clearButton位置,改变size可能致使button的图片失真图片

– leftViewRectForBounds:it

– rightViewRectForBounds:class


经过– drawPlaceholderInRect:方法可改变placeHolder颜色、字体,请看代码:

首先定义一个类CustomTextField让它继承UITextField实现如下方法便可:

//控制清除按钮的位置

-(CGRect)clearButtonRectForBounds:(CGRect)bounds

{

   return CGRectMake(bounds.origin.x + bounds.size.width - 50, bounds.origin.y + bounds.size.height -201616);

}


//控制placeHolder的位置,左右缩20

-(CGRect)placeholderRectForBounds:(CGRect)bounds

{

    

    //return CGRectInset(bounds, 20, 0);

   CGRect inset = CGRectMake(bounds.origin.x+100, bounds.origin.y, bounds.size.width -10, bounds.size.height);//更好理解些

   return inset;

}

//控制显示文本的位置

-(CGRect)textRectForBounds:(CGRect)bounds

{

    //return CGRectInset(bounds, 50, 0);

    CGRect inset = CGRectMake(bounds.origin.x+190, bounds.origin.y, bounds.size.width -10, bounds.size.height);//更好理解些

    

    return inset;


}

//控制编辑文本的位置

-(CGRect)editingRectForBounds:(CGRect)bounds

{

    //return CGRectInset( bounds, 10 , 0 );

    

   CGRect inset = CGRectMake(bounds.origin.x +10, bounds.origin.y, bounds.size.width -10, bounds.size.height);

   return inset;

}

//控制左视图位置

- (CGRect)leftViewRectForBounds:(CGRect)bounds

{

   CGRect inset = CGRectMake(bounds.origin.x +10, bounds.origin.y, bounds.size.width-250, bounds.size.height);

   return inset;

    //return CGRectInset(bounds,50,0);

}


//控制placeHolder的颜色、字体

- (void)drawPlaceholderInRect:(CGRect)rect

{

    //CGContextRef context = UIGraphicsGetCurrentContext();

    //CGContextSetFillColorWithColor(context, [UIColor yellowColor].CGColor);

    [[UIColororangeColorsetFill];

    

    [[selfplaceholderdrawInRect:rectwithFont:[UIFontsystemFontOfSize:20]];

}


 

//下面是使用CustomTextField的代码,可放在viewDidLoad等方法中

  

    _textField = [[CustomTextField alloc] initWithFrame:CGRectMake(20, 150, 280, 30)];
    _textField.placeholder = @"请输入账号信息";
    _textField.borderStyle = UITextBorderStyleRoundedRect;
    _textField.textAlignment = UITextAlignmentLeft;
    _textField.delegate = self;
    _textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    _textField.text = @"aa";
    UIImageView *imgv = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon-iwant-2.png"]];
    _textField.leftView = imgv;
    _textField.leftViewMode = UITextFieldViewModeAlways;
    [self.view addSubview:_textField];
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