CODEWITHSUNDEEP
iosobjective-cnsstringios7
Roland
Roland

Reputation: 9731

drawAtPoint does not render the text in the view

I'm trying to append a string to the view with the drawAtPoint:point withAttributes:attrs method, but the string is not to be seen anywhere inside the view, or at least I cannot see it (it might be that the color is the same as the view, white).

The following code is what I use in the viewDidLoad of my view controller:

NSMutableDictionary *stringAttributes = [[NSMutableDictionary alloc] init];


[stringAttributes setObject:[UIColor redColor]forKey: NSForegroundColorAttributeName];


NSString *someString = [NSString stringWithFormat:@"%@", @"S"];

[someString drawAtPoint:CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height / 2) withAttributes: stringAttributes];

What is it that I'm doing wrong ?

EDIT: After following @rokjarc's suggestions, I have created a view controller with a drawRect method that adds the string to the current context:

#import <Foundation/Foundation.h>


@interface XYZSomeView : UIView
@end

#import "XYZSomeView.h"
#import "NSString+NSStringAdditions.h"


@implementation XYZSomeView

- (void)drawRect:(CGRect)rect {

    [super drawRect:rect];

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);

    NSMutableDictionary *stringAttributes = [[NSMutableDictionary alloc] init];


    [stringAttributes setObject:[UIColor redColor]forKey: NSForegroundColorAttributeName];


    NSString *someString = [NSString stringWithFormat:@"%@", @"S"];

    [someString drawAtPoint:CGPointMake(rect.origin.x, rect.origin.y) withAttributes: stringAttributes];

    NSLog(@"%@", someString);

    CGContextRestoreGState(context);
}

@end

And inside my root view controller I init the XYZSomeView:

#import "XYZRootViewController.h"
#import "XYZSomeView.h"


@implementation XYZRootViewController
- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];



    XYZSomeView *someView = [[XYZSomeView alloc] init];

    [self.view addSubview:someView];

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];

    NSLog(@"%@", @"XYZRootViewController reveived memory warning");
}
@end

The issue is that my drawRect is not called, is that because I have to call it myself ? I thought that this method should be called upon initialization without me having to call it.

Upvotes: 2

Views: 1429

Answers (1)

Rok Jarc
Rok Jarc

Reputation: 18875

You will need a reference to current graphics context in order to use this function: docs. You don't have this reference within viewDidLoad:. Usually this is done within drawRect:. There are ways to use it while generating a content off screen - but this doesn't seem to fit your needs.

If you want to add a simple text to a view controller in its' viewDidLoad consider adding simple UILabel with transparent background to the view of this view controller.

Upvotes: 2

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