UITextView折りたたみ可能な がありますTableViewCell。で、上のテキストと下のテキストをフェードアウトさUITextViewせたいです。CAGradientLayer
を入れて作りUIViewましUITextViewた。これはすべてセル内にあります
セルまたはView Controllerでコードを設定する方法がわかりません。
私のテスト コードは Github: Fun with Mask by Ewan Davids からのものです。
[self createGradientMask];
(void)メソッドはどこに置くべきですか？TableViewCellまたはViewController? _
- (void)createGradientMask
{
//creating our gradient mask
CAGradientLayer *maskLayer = [CAGradientLayer layer];
//this is the anchor point for our gradient, in our case top left. setting it in the middle (.5, .5) will produce a radial gradient. our startPoint and endPoints are based off the anchorPoint
maskLayer.anchorPo = CGPointZero;
//The line between these two points is the line our gradient uses as a guide
//starts in bottom left
maskLayer.startPoint = CGPointMake(0.0f, 1.0f);
//ends in top right
maskLayer.endPoint = CGPointMake(1.f, 0.0f);
//setting our colors - since this is a mask the color itself is irrelevant - all that matters is the alpha. A clear color will completely hide the layer we're masking, an alpha of 1.0 will completely show the masked view.
UIColor *outerColor = [UIColor colorWithWhite:1.0 alpha:0.0];
UIColor *innerColor = [UIColor colorWithWhite:1.0 alpha:1.0];
//an array of colors that dictatates the gradient(s)
maskLayer.colors = @[(id)outerColor.CGColor, (id)outerColor.CGColor, (id)innerColor.CGColor, (id)innerColor.CGColor];
//these are percentage points along the line defined by our startPoint and endPoint and correspond to our colors array. The gradient will shift between the colors between these percentage points.
maskLayer.locations = @[@0.0, @0.15, @0.5, @1.0f];
maskLayer.bounds = CGRectMake(0, 0, CGRectGetWidth(self.view.bounds),
CGRectGetHeight(self.view.bounds));
self.underTextView.layer.mask = maskLayer;
}
- では、プロパティ
TableViewCellを認識しません。view - では、
ViewControllerを認識できませんUITextView property。
QuartzCore.framework が追加されました。