改變UITextField placeHolder顏色、字體 、輸入光標位置等
我們有時需要定制化UITextField對象的風格，可以添加許多不同的重寫方法，來改變文本字段的顯示行為。這些方法都會返回一個CGRect結構，制定了文本字段每個部件的邊界范圍，甚至修改placeHolder顏色，字體。
– textRectForBounds://重寫來重置文字區域
– drawTextInRect://改變繪文字屬性.重寫時調用super可以按默認圖形屬性繪制,若自己完全重寫繪制函數，就不用調用super了.
– placeholderRectForBounds://重寫來重置占位符區域
– drawPlaceholderInRect://重寫改變繪制占位符屬性.重寫時調用super可以按默認圖形屬性繪制,若自己完全重寫繪制函數，就不用調用super了
– borderRectForBounds://重寫來重置邊緣區域
– editingRectForBounds://重寫來重置編輯區域
– clearButtonRectForBounds://重寫來重置clearButton位置,改變size可能導致button的圖片失真
– leftViewRectForBounds:
– rightViewRectForBounds:
通過– drawPlaceholderInRect:方法可改變placeHolder顏色、字體，請看代碼：
首先定義一個類CustomTextField讓它繼承UITextField實現以下方法即可：
//控制清除按鈕的位置
-(CGRect)clearButtonRectForBounds:(CGRect)bounds
{
returnCGRectMake(bounds.origin.x+ bounds.size.width-50, bounds.origin.y+ bounds.size.height-20,16,16);
}
//控制placeHolder的位置，左右縮20
-(CGRect)placeholderRectForBounds:(CGRect)bounds
{
//return CGRectInset(bounds, 20, 0);
CGRectinset =CGRectMake(bounds.origin.x+100, bounds.origin.y, bounds.size.width-10, bounds.size.height);//更好理解些
returninset;
}
//控制顯示文本的位置
-(CGRect)textRectForBounds:(CGRect)bounds
{
//return CGRectInset(bounds, 50, 0);
CGRectinset =CGRectMake(bounds.origin.x+190, bounds.origin.y, bounds.size.width-10, bounds.size.height);//更好理解些
returninset;
}
//控制編輯文本的位置
-(CGRect)editingRectForBounds:(CGRect)bounds
{
//return CGRectInset( bounds, 10 , 0 );
CGRectinset =CGRectMake(bounds.origin.x+10, bounds.origin.y, bounds.size.width-10, bounds.size.height);
returninset;
}
//控制左視圖位置
- (CGRect)leftViewRectForBounds:(CGRect)bounds
{
CGRectinset =CGRectMake(bounds.origin.x+10, bounds.origin.y, bounds.size.width-250, bounds.size.height);
returninset;
//return CGRectInset(bounds,50,0);
}
//控制placeHolder的顏色、字體
- (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的代碼，可放在viewDidLoad等方法中
_textField= [[CustomTextFieldalloc]initWithFrame:CGRectMake(20,150,280,30)];
_textField.placeholder=@"請輸入帳號信息";
_textField.borderStyle=UITextBorderStyleRoundedRect;
_textField.textAlignment=UITextAlignmentLeft;
_textField.delegate=self;
_textField.clearButtonMode=UITextFieldViewModeWhileEditing;
_textField.text=@"aa";
UIImageView*imgv = [[UIImageViewalloc]initWithImage:[UIImageimageNamed:@"icon-iwant-2.png"]];
_textField.leftView= imgv;
_textField.leftViewMode=UITextFieldViewModeAlways;
[self.viewaddSubview:_textField];
