Intermediate Auto Layout

Talk given at CocoaHeads Boston.

Transcript

1. Intermediate
 Auto Layout
2. Layout Guides
3. Layout Guides id topLayoutGuide = self.topLayoutGuide; NSDictionary *views = NSDictionaryOfVariableBindings(topLayoutGuide, someView); ... @"V:[topLayoutGuide]-[someView]" ...
4. Scroll Views
5. Scroll Views
6. Scroll Views [NSLayoutConstraint
 constraintWithItem:container
 attribute:NSLayoutAttributeWidth
 relatedBy:NSLayoutRelationEqual
 toItem:scrollView
 attribute:NSLayoutAttributeWidth
 multiplier:1
 constant:0];
7. Scroll Views - (void)keyboardWillShow:(NSNotification *)notification { CGFloat offset = ...; self.bottomConstraint.constant = offset; [UIView animate...:^{ [self.view layoutIfNeeded]; }]; }
8. Custom Views • Should know their intrinsic size • constraints • intrinsicContentSize
9. Custom Views • Should know how to be laid out • alignmentRectInsets
10. Custom Views return UIEdgeInsetsMake(25, 0, 0, 25); 1
11. Compression Resistance This is some pretty long text. Low High High
12. Compression Resistance This is some … Low High High
13. Compression Resistance [view setContentCompressionResistancePriority:UILayoutPriorityDefaultLow forOrientation:UILayoutConstraintOrientationHorizontal];
14. Hugging Text Text Low High High Text
15. Hugging Text Text Low High High Text
16. Hugging [view setContentHuggingPriority:UILayoutPriorityDefaultLow forOrientation:UILayoutConstraintOrientationHorizontal] ;
17. Misc. • Align views/controls that contain text using NSLayoutAttributeBaseline, not NSLayoutAttributeCenterY • Manage constraints with views, not view controllers • Avoid using explicit sizes