我们有时需要定制化UITextField对象的风格,可以添加许多不同的重写方法,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,制定了文本字段每个部件的边界范围,甚至修改placeHolder颜色,字体。
– textRectForBounds: //重写来重置文字区域 – drawTextInRect: //改变绘文字属性.重写时调用super可以按默认图形属性绘制,若自己完全重写绘制函数,就不用调用super了. – placeholderRectForBounds: //重写来重置占位符区域 – drawPlaceholderInRect: //重写改变绘制占位符属性.重写时调用super可以按默认图形属性绘制,若自己完全重写绘制函数,就不用调用super了 – borderRectForBounds: //重写来重置边缘区域 – editingRectForBounds: //重写来重置编辑区域 – clearButtonRectForBounds: //重写来重置clearButton位置,改变size可能导致button的图片失真 – leftViewRectForBounds: – rightViewRectForBounds:
通过– 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实现以下方法即可: //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 -20, 16, 16); }
//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); [[UIColororangeColor] setFill];
[[selfplaceholder] drawInRect: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];
转自:http://blog.csdn.net/leeyehong_self/article/details/7939147 |
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来自: plumbiossom > 《代码》