I have added a UIView
on my storyboard and connected the following code to it successfully (ie the thing draws on the screen when I load the app)
#import "UIView+DrawView.h"
@implementation DrawView
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
// Initialization code
}
return self;
}
- (void) drawRect:(CGRect)rect
{ //Get the CGContext from this view
CGContextRef context = UIGraphicsGetCurrentContext();
//Set the stroke (pen) color
CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
//Set the width of the pen mark
CGContextSetLineWidth(context, 5.0);
// Draw a line
//Start at this point
CGContextMoveToPoint(context, 10.0, 30.0);
//Give instructions to the CGContext
//(move "pen" around the screen)
CGContextAddLineToPoint(context, 310.0, 30.0);
CGContextAddLineToPoint(context, 310.0, 90.0);
CGContextAddLineToPoint(context, 10.0, 90.0);
//Draw it
CGContextStrokePath(context);
}
@end
What I would want however is to manually toggle this UIView
to appear, which I cannot seem to do. I have tried the following:
UIView
to Hidden in Storyboard and DrawView.Hidden = YES;
to no avail, in both cases it draws immediately; I hope that you can guide me on what I am missing here.
确保在情节提要中将“自定义类”属性设置为您的类。
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