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IOS_改變UITextField placeHolder顏色、字體

編輯:關於IOS

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。

C textRectForBounds:   //重寫來重置文字區域

C 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.

C placeholderRectForBounds:  //重寫來重置占位符區域

C 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

C borderRectForBounds:  //重寫來重置邊緣區域

C editingRectForBounds:  //重寫來重置編輯區域

C clearButtonRectForBounds:  //重寫來重置clearButton位置,改變size可能導致button的圖片失真

C leftViewRectForBounds:

C rightViewRectForBounds:

通過C 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

{

return CGRectMake(bounds.origin.x + bounds.size.width - 50, bounds.origin.y + bounds.size.height -20, 16, 16);

}

//控制placeHolder的位置,左右縮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;

}

//控制顯示文本的位置

-(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;

}

//控制編輯文本的位置

-(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;

}

//控制左視圖位置

- (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 = [[CustomTextField alloc] 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 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon-iwant-2.png"]];

_textField.leftView = imgv;

_textField.leftViewMode = UITextFieldViewModeAlways;

[self.view addSubview:_textField];

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