ios - How do I create a UIView subclass with a transparent gradient background? -


I want to create a custom UIView which has a transparent gradient background to make the text more This custom view appears on the rear view.

Here is an example image:

Enter image details here

Paint the orange box under my transparent gradient view is a UIView . Then I will put text at the top of the transparent shield view and because of its darkness, the text will appear more, but you can see some orange box behind it.

I am UIView . 

  - (zero) draw in my custom  UIView  's  drawRect  : (CGRTact) shortcut {CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB (); CGContextRef Reference = UIGraphicsGetCurrentContext (); NSArray * gradientColors = @ [[id] [UIColor colorWithWhite: 0.0 alpha: 0.0] .Color, (id) [UIColor colorWithWhite: 0.0 alpha: 0.55] .CGColor, (id) [UIColor colorWithite: 0.0 alpha: 0.7]]; CGFloat Gradient Lesses [] = {0, 0.77, 1}; CGGradientRef Slope = CGGradientCreateWithColors (Color space, (__Bridge CFArrayRef) Gradient Colors, Gradient Lacs); CGPoint StartPoint = CGPEXMAC (CGRactGetMIDX (RECT), CGRactGatmini (RECT)); CGPoint Endpoint = CGPXMake (CGRactGetMIDX (RECT), CGRactGetMXY (Rect)); CGContextDrawLinearGradient (Reference, Slope, Start Page, End Page, 0); CGGradientRelease (Slope); }   
 But it does not support transparency, like when I add that code from  UIView  to  self.view  Opaque black  
 How do I do this in CSS:  
  Background image: Linear-gradient (-180 degrees, RGBA (0,0,0,0.00.00) 0% , RGBA (0,0,0,0,5,5) 23%, RGBA (0,0,0,0.70.70) 100%);   
 But again, I do not know how to make this custom  UIView  subclass.   
 
 
 I will not be disturbed with core graphics, so I will use  CAGradientLayer  .  
     
  1.  
     Override  + + + in your class   
      + (class) layer class {return [CAGRD and LEA class]; }    
  2.  
     To redefine the  layer  property in the interface to use this class.  
      @property (nonatomic, read-only, retaining) CAGradientLayer * Layer;    
  3.  
     Set color and other attributes.  
      self.layer.colors = gradientColors; Self.layer.locations = gradientLocations; // but at the same time as `NSARRA` the self.layer.startPoint = startpoint; // 0 to 1 from self.layer.endPoint = endPoint; // to 0 to 1

Comments

Post a Comment

Popular posts from this blog

python - how we can use ajax() in views.py in django? -

I have a little code here. Could you please tell me what this code really does? please. Here in the AJAX call: $ .ajax ({url: "{% url} upload_document '%}", type: "POST", data : {Csrfmiddletoken: document.getElementsByName ('csrfmiddletoken') [0] Price, Title: document.getElementById ('title'). Value, // document: document: document.getElementById ('document'),}, datatype: "Jason", success: function (feedback) {if (feedback == "true") {// success} other {// attachment errors}}}); How AJAX works in the Django and how we can see the AJAX request. Here is the idea of ​​my thoughts def upload_document (requested): Print request. POTT print request FILES if request.is_ajax (): If request.method == 'POST': form = UploadForm (request.POST, request.FILES, user = request.user) if form.is_valid (): Form.save () return HTTPPCS (SimpleJason Dumps ('True'), Mime Type = 'App / Jason') Other:...
Read more

matlab - Using loops to get multiple values into a cell -

I have 31 topics (S1, S2, S3, S4, etc.) 3 images in each topic, opposite 1 IMG, Contrast 2 IMG and Contrast 3 Are IMG I p In a NX1 cell named P, I would like to use a loop to get all the paths of contrasts from all the subjects: data / S1 / contrast1.img / S1 / contrast2.img data / S1 / contrast3.img data / s2 / contrast1.img data / S2 / contrast2.img Data / S2 / contrast3.img ... Data / S31 / contast3.img This is what I've tried: A = {'S1', 'S2', 'S3', ..., 'S31'}; % All topics C = {'contrast1.img', 'contrast2.img', 'contrast3.img'}; For each = P = cell (31 * 3,1) for each topic, the required contrast images: Length = A for Jammu = 1: Length (C) P {j} = spm_select ('FPList', Fullfile (data_path, q {i}) sprint ('% s', cell2mat (c))); % Of each topic is to select three contrast images, it works in my script, it is probably not 100% correct, because I had to simplify this example. End of ...
Read more

python - Sequence Pattern recognition with Pybrain -

Image
I am constantly trying to use recurrent neural networks to classify a series of data. To be more specific, I have a sequence of sensor reading (which is continuous over time), I have to learn an algorithm which can detect the state related to this pattern, given the readings change. Example: Time step_1: 1.4 Time step_2: 1 Time step_3: 0.8 State = New Sequence: Time Phase 1: 0.4 Time Phase 2: 0.3 Time Phase 3: 0.1 State = Sitting I actually have 12 censors, I'm just showing a sequence of numbers for convenience. (Numbers are not real, I'm just trying to fulfill this idea)! I am trying to make my network with PyBrain RNN, however, I can not get a Data Set Container that can detect it, like information I tried to use sequential data But after some testing I came to know that this number is the next element in the sequence of numbers. Here's how I prepare my dataset: self.alldata = SequentialDataSet (ds.num_features, 1) # Now add samples to the dat...
Read more