I want to implement below chart like structure.
Explanation:
1. Each block should be clickable.
2. If the block is selected, it will be highlighted(i.e. Red block in figure).
I initially google for this but was unable to find. What should be "Drawing logic" corresponding to this with animation?Thanx in advance.
I think you need to use MCSegmentedControl.
You can get it from here.
Generally speaking, I'd have an image for the outline with a transparent middle, then dynamically create colored blocks behind it of the appropriate colors, with dynamic labels. The highlighting is a little tricky, but could be done with a set of image overlays. One could also try to shrink and expand fixed images for the bars/highlighting, but iPhone scales images poorly.
(Will it always be 4 blocks? There are a couple of other ways to manage it using fixed-size images overlaying each other.)
Maybe you should look into using CALayer for this?
U need to implement this type of logic using button. Just scale button width according to percentage.
And to make round rect button like appearance use the code below and don't forget to import quartz-core framework in class file.
And to scale first and last button as you need some overlap from nearby button.
btn.layer.cornerRadius = 8.0;
btn.layer.borderWidth = 0.5;
btn.layer.borderColor = [[UIColor blackColor] CGColor];
Related
I found out how to change the colour of constraints:
draw_options = pymunk.pygame_util.DrawOptions(screen)
draw_options.constraint_color = 200,200,200
But when drawing small objects, the size of the constraint appears to be too large and makes it look bad.
Is there a way to reduce the size of those pin joints? Instead of a radius of 5 pixels, I'd prefer 1 or 2 pixel radius joints/constraints.
An alternative was to make it partly transparent, but adding an alpha component to the colour doesn't seem to work.
draw_options.constraint_color = 200,200,200,50
Unfortunately the debug draw color for constraints doesnt work. https://github.com/viblo/pymunk/issues/160
But in general if you want special drawing its probably easiest to do it yourself. Its mainly meant for debugging and quick prototyping, so if you need more than whats included try drawing it yourself instead. There are some examples that does custom drawing and does not depend on the debug draw code.
I need to create a time bar like the image attached.The blue lines are the dates indicating some actions.The big Red Arrow mark is used to slide for selecting any of the blue line. At background the bar is divided into years.The small red circles are to indicate the years.
Any idea ,how do i start?
Thanks
If the blue bars don't move a lot, and you don't need to resize this view very often (which is usually the case on an iPhone), then I'd recommend subclassing UIControl (or UIView) and implement it yourself.
Have an NSArray property storing NSDate objects and methods like addDate:, removeDate:, removeDateAtIndex: to change it's content from an other object (like your view controller). In these methods you add or remove the passed date and call [self setNeedsDisplay]; to redraw the lines.
You will need a few methods to calculate the position (in pixels) of a date on the slider and to calculate the date at a specific coordinate. This should be easy to to (basic linear interpolation).
And assuming that the red slider is only able to point to blue lines (but not between them) add a NSDate pointer variable to the currently selected date. In the
In the drawRect: method, you need to draw all the lines using CoreGraphics functions. Look up the documentation if you need help with this. Apple has some great sample apps too.
To show the red slider, you could either add a custom UIImageView, with a UIPanGestureRecognizer and make sure it only moves vertically in the gesture handler. Or it might be possible to add a UISlider without track images (I'm not 100% sure about that). In either case, you need to adjust the slider's position once the user let's go and make it jump to the nearest blue line.
A rough idea,
1. Get the length of the entire TimeBar.Let it be t.
2. Divide by x=numberofYears*365.let it be t_eachday_pos=t/x
3. get the position of each day,calculate its offset as daycount*t_eachday_pos;
4. Add your blueLine as a customButton.
5. To do some action, pass the x daynumber(eg. day 245 of year 2 etc.)
Try this, I have used the same thing in one of my app, and it is working
I would like to set custom color programmatically using the method
[UIColor colorWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha];
For which i need to know the value of RBG components.
I would like to know is there any way by which i can get the RBG components of a custom color so that i can use them in the above mentioned method.
You can use the DigitalColor Meter.app included with every Mac OS X install. You can find it in ~/Applications/Utilities/DigitalColor Meter.app. Use it to inspect the RGB values of any pixel you mouse over. Once you have the values, you just need to divide them by 255.0 because +colorWithRed:green:blue:alpha: is expecting a floating point value between 0 and 1.
[UIColor colorWithRed:83.0f/255.0f green:217.0f/255.0f blue:58.0f/255.0f alpha:1.0f];
You can use Xcode itself to get RGB value of custom color:
Click the arrow for the Color box and in the resulting dialog box choose others.
And then you can use RGB Slider option to get RGB values
To match a color exactly, there is a great utility called "DigitalColor Meter" located in Applications/Utilities/ that can get the RGB for anything on your screen. Take a screen shot of the color you want to replicate, then use this tool to get the information.
Actually there is no need for using DigitalColor Meter instead we can use the small Search Icon on color picker in the Interface Builder with which we can exactly adjust the color that we like.It is also possible to look up the color values using RBG scales available in it.
I want to draw a text with different colors and the only way that I've found for do it is to split every piece of string-color in differents UILabels, so currently now I have four UILabels one after another, lets say, label1, label2, label3 and label4.
The problem with that is with the size and the position of every labels, I've not found an automatic way for do it.
The only way is:
Set the text inside all the labels
Ask for the width of all the labels with this new text
Resize all the labels with this new width
Move label2 to label1.x + label1.width, and so on
This is really the only way in iPhone for do that?
I came from Android and there is a "wrap_content" property for every view and "relative_layouts" where you can define something like.. put label2 rightOf label1. So I'm looking of something simple and automatic like that, but in iPhone.
Thanks!
Depending on your application, you might want to consider a single UIWebView instead. Then you can style the content of it with HTML and CSS.
I have two UILabels. that I want to overlap one atop the other. Call the labels "under" and "over".
over: A C E G
under: B D F
UILabel "over" will have its text drawn in red. "under" will be in blue. The visual effect will be alternating colors between successive letters.
What are the controls available to me to exactly align the text in each label to pull this off?
Cheers,
Doug
I agree with fbrereton. This seems a very hard way to achieve the goal. Check out the NSString UIKit Additions to learn how to draw your own strings and lay the characters out yourself in your own custom -drawRect:. You'll have far greater control, and the code should not be that complex. iPhone doesn't have very good layout support (nothing like Mac offers), but for something this simple, it shouldn't be too bad.
You have to make sure the font you are using is a monospace font, otherwise the characters will not line up exactly as you would hope with just a space between them. (I believe there is a typewrite font available in the iPhone OS that is monospace; YMMV.) Also you will have to prefix underLabel with a space for the code below to work.
To map one UILabel on top of another, try:
overLabel.opaque = NO; // so you can see what is under overLabel
overLabel.textColor = [UIColor redColor];
overLabel.backgroundColor = [UIColor clearColor];
underLabel.frame = overLabel.frame;
underLabel.textColor = [UIColor blueColor];
Note in the above code underLabel takes on overLabel's frame because the latter's frame is wider; if it were the other way around overLabel would get clipped.
All that being said I'd wager there is a better way to skin this particular cat. This solution feels very "round peg, square hole" to me.