IOS - Drawing a rounded square square

Question

I am trying to create a 200px square with rounded corners to use as an indicator of the iOS toast style.

I have the following:

- (void)drawRect:(CGRect)rect {

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.1].CGColor);
    CGContextMoveToPoint(context, 10, 0);
    CGContextAddLineToPoint(context, 95, 0);
    CGContextAddArcToPoint(context, 100, 0, 100, 5, 10);
    CGContextAddLineToPoint(context, 100, 95);
    CGContextAddArcToPoint(context, 100, 100, 95, 100, 10);
    CGContextAddLineToPoint(context, 5, 100);
    CGContextAddArcToPoint(context, 0, 100, 0, 95, 10);
    CGContextAddLineToPoint(context, 0, 5);
    CGContextAddArcToPoint(context, 0, 0, 5, 0, 10);
    CGContextFillPath(context);
}

I got this far, following the tutorial - it draws a perfect 100px with rounded corners of the square, but I need a 150px square! I changed all the settings you can imagine - with some bizzare results - but I can’t determine how the height of the width is determined !? Can anyone advise?

Answer 1

If you import the QuartzCore framework:

#import <QuartzCore/QuartzCore.h>

and add it to your project, you can use below:

UIView *temp = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
temp.layer.cornerRadius = 5;

Answer 2

drawRect, , bezierpath, .

- (void)drawRect:(CGRect)rect {
       [super drawRect:rect];
       [[UIColor blueColor] setFill];
       UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect /*CGRectMake(0, 0, 150, 150)*/ cornerRadius:10.0];
       [path fill];
}

Answer 3

• /.

• /.

• Profit!

Here is your code modified to show what I mean (unverified):

- (void)drawRect:(CGRect)rect {
    static CGFloat length = 100;
    static CGFloat rounding = 5;

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.1].CGColor);
    CGContextMoveToPoint(context, rounding * 2, 0);
    CGContextAddLineToPoint(context, length - rounding, 0);
    CGContextAddArcToPoint(context, length, 0, length, rounding, rounding * 2);
    CGContextAddLineToPoint(context, length, length - rounding);
    CGContextAddArcToPoint(context, length, length, length - rounding, length, rounding * 2);
    CGContextAddLineToPoint(context, rounding, length);
    CGContextAddArcToPoint(context, 0, length, 0, length - rounding, rounding * 2);
    CGContextAddLineToPoint(context, 0, rounding);
    CGContextAddArcToPoint(context, 0, 0, rounding, 0, rounding * 2);
    CGContextFillPath(context);
}

I also wonder about 10 in your code. As far as I can see, they should be 5 seconds instead. In any case, it’s easier to use UIBezierPath, as others have shown (the solution of the layer works, but obviously this will not work if, for example, you want to draw something below a rounded rectangle and something above).

Answer 4

Why don't you use the bezier path?

CGFloat radius =  4;
CGRect rect = CGRectMake(0,0,200,200);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius];
[[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.1] setFill];
[path fill];