Because your drawing code is broken.
NSRectFill( self.frame ) fills starting at the *frame* offset which is 100, so
you don't draw the left 100 px. You always want to draw relative to 0,0 in a
drawRect: call. Or you could just have set the background colour.
changing it to NSRectFill( dirtyRect ) will do what you want.
There's a menu option, Debug->View Debugging->Show Frame Rects which might have
helped you here.
On 3 May, 2014, at 4:59 pm, Tae Won Ha wrote:
> Hi, guys.
>
> I have a problem using Auto Layout in Cocoa. What I want achieve is
> simple: I have two custom views, say, Left and Right. I want Left to be
> always 100 wide and Right to be flexible, ie resize with the Window:
> +--+---+
> | | |
> | Left | Right|
> | 100 wide | flexible |
> | | |
> +--+---+
>
> I tried H:|[left(100)][right(>=100)]| as follows:
>
> - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
> NSView *contentView = self.window.contentView;
>
> DummyView *left = [[DummyView alloc] initWithFrame:CGRectZero];
> left.translatesAutoresizingMaskIntoConstraints = NO;
> left.backgroundColor = [NSColor yellowColor];
> [contentView addSubview:left];
>
> DummyView *right = [[DummyView alloc] initWithFrame:CGRectZero];
> right.translatesAutoresizingMaskIntoConstraints = NO;
> right.backgroundColor = [NSColor greenColor];
> [contentView addSubview:right];
>
> NSDictionary *views = @{
> @"left" : left,
> @"right" : right,
> };
>
> // what am I doing wrong?
> [contentView addConstraints:[NSLayoutConstraint
> constraintsWithVisualFormat:@"H:|[left(100)][right(>=100)]|" options:0
> metrics:nil views:views]];
> [contentView addConstraints:[NSLayoutConstraint
> constraintsWithVisualFormat:@"V:|[left]|" options:0 metrics:nil
> views:views]];
> [contentView addConstraints:[NSLayoutConstraint
> constraintsWithVisualFormat:@"V:|[right]|" options:0 metrics:nil
> views:views]];
> }
>
> The DummyView:
>
> @interface DummyView : NSView
> @property (copy) NSColor *backgroundColor;
> @end
>
> @implementation DummyView
> - (void)drawRect:(NSRect)dirtyRect {
> [_backgroundColor set];
> NSRectFill(self.frame);
> }
> @end
>
> The resulting window looks as follows:
> http://taewon.de/left-right-screenshot.png or
> +--+--+-+
> | | | |
> | Left | empty | Right |
> | 100 wide | space | flexible |
> | | | |
> +--+--+-+
>
> Why is there an empty space (100 wide) between Left and Right? I also
> tried to set the width constraint of Left using
> +constraintsWithVisualFormat:options:metrics:views:, but I get the same
> result. Am I missing something here?
>
> The project can be also downloaded: https://github.com/qvacua/sandbox
>
> Thanks in advance and best,
> Tae
>
> --
> @hataewon
> http://taewon.de
>
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