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August 29, 2015 13:56
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Playing around with autolayout in iOS
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| - (void)loadView | |
| { | |
| self.modalTransitionStyle = UIModalTransitionStyleCoverVertical; | |
| UIView *view = [[UIView alloc] init]; | |
| view.backgroundColor = [UIColor redColor]; | |
| [view setBackgroundColor:[UIColor redColor]]; | |
| [self setView:view]; | |
| UIButton *dismissButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; | |
| dismissButton.backgroundColor = [UIColor whiteColor]; | |
| dismissButton.translatesAutoresizingMaskIntoConstraints = NO; | |
| [dismissButton setTitle:@"Dismiss" forState:UIControlStateNormal]; | |
| UILabel *disclosureLabel = [[UILabel alloc] init]; | |
| disclosureLabel.font = [UIFont boldSystemFontOfSize:14]; | |
| disclosureLabel.numberOfLines = 0; | |
| disclosureLabel.shadowOffset = CGSizeMake(0.0, -1.0); | |
| disclosureLabel.text = @"Error messages will only be displayed during development. When your app is packaged for final distribution, no error screen will appear. Test your code!"; | |
| disclosureLabel.textColor = [UIColor blackColor]; | |
| disclosureLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
| UIView *centerView = [[UIView alloc] init]; | |
| centerView.translatesAutoresizingMaskIntoConstraints = NO; | |
| UILabel *titleLabel = [[UILabel alloc] init]; | |
| titleLabel.font = [UIFont boldSystemFontOfSize:32]; | |
| titleLabel.shadowColor = [UIColor darkGrayColor]; | |
| titleLabel.shadowOffset = CGSizeMake(2.0, 1.0); | |
| titleLabel.text = @"Application Error"; | |
| titleLabel.textAlignment = NSTextAlignmentCenter; | |
| titleLabel.textColor = [UIColor greenColor]; | |
| titleLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
| UILabel *messageLabel = [[UILabel alloc] init]; | |
| messageLabel.font = [UIFont boldSystemFontOfSize:20]; | |
| messageLabel.numberOfLines = 0; | |
| messageLabel.shadowColor = [UIColor blackColor]; | |
| messageLabel.shadowOffset = CGSizeMake(0.0, -1.0); | |
| messageLabel.text = @"Some Javascript syntax error here..."; | |
| messageLabel.textAlignment = NSTextAlignmentCenter; | |
| messageLabel.textColor = [UIColor whiteColor]; | |
| messageLabel.translatesAutoresizingMaskIntoConstraints = NO; | |
| [view addSubview:titleLabel]; | |
| [view addSubview:centerView]; | |
| [centerView addSubview:messageLabel]; | |
| [centerView addSubview:dismissButton]; | |
| [view addSubview:disclosureLabel]; | |
| [titleLabel release]; | |
| [centerView release]; | |
| [messageLabel release]; | |
| [disclosureLabel release]; | |
| [view release]; | |
| NSLayoutConstraint *disclosureContraint1 = [NSLayoutConstraint constraintWithItem:disclosureLabel | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:view | |
| attribute:NSLayoutAttributeLeading | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *disclosureContraint2 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:disclosureLabel | |
| attribute:NSLayoutAttributeTrailing | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *disclosureContraint3 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeBottom | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:disclosureLabel | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *titleConstraint1 = [NSLayoutConstraint constraintWithItem:titleLabel | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:view | |
| attribute:NSLayoutAttributeTop | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *titleConstraint2 = [NSLayoutConstraint constraintWithItem:titleLabel | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:view | |
| attribute:NSLayoutAttributeLeading | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *titleConstraint3 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:titleLabel | |
| attribute:NSLayoutAttributeTrailing | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *messageConstraint1 = [NSLayoutConstraint constraintWithItem:centerView | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:messageLabel | |
| attribute:NSLayoutAttributeTrailing | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *messageConstraint2 = [NSLayoutConstraint constraintWithItem:messageLabel | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeLeading | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *messageConstraint3 = [NSLayoutConstraint constraintWithItem:messageLabel | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeTop | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *buttonConstraint1 = [NSLayoutConstraint constraintWithItem:centerView | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:dismissButton | |
| attribute:NSLayoutAttributeTrailing | |
| multiplier:1 | |
| constant:80]; | |
| NSLayoutConstraint *buttonConstraint2 = [NSLayoutConstraint constraintWithItem:dismissButton | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeLeading | |
| multiplier:1 | |
| constant:80]; | |
| NSLayoutConstraint *buttonConstraint3 = [NSLayoutConstraint constraintWithItem:dismissButton | |
| attribute:NSLayoutAttributeBottom | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *buttonConstraint4 = [NSLayoutConstraint constraintWithItem:dismissButton | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:messageLabel | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1 | |
| constant:40]; | |
| NSLayoutConstraint *centerConstraint1 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeCenterX | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeCenterX | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *centerConstraint2 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeCenterY | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeCenterY | |
| multiplier:1 | |
| constant:0]; | |
| NSLayoutConstraint *centerConstraint3 = [NSLayoutConstraint constraintWithItem:centerView | |
| attribute:NSLayoutAttributeLeading | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:view | |
| attribute:NSLayoutAttributeLeading | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *centerConstraint4 = [NSLayoutConstraint constraintWithItem:view | |
| attribute:NSLayoutAttributeTrailing | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeTrailing | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *centerConstraint5 = [NSLayoutConstraint constraintWithItem:centerView | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationGreaterThanOrEqual | |
| toItem:titleLabel | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1 | |
| constant:20]; | |
| NSLayoutConstraint *centerConstraint6 = [NSLayoutConstraint constraintWithItem:disclosureLabel | |
| attribute:NSLayoutAttributeTop | |
| relatedBy:NSLayoutRelationGreaterThanOrEqual | |
| toItem:centerView | |
| attribute:NSLayoutAttributeBottom | |
| multiplier:1 | |
| constant:20]; | |
| [centerView addConstraint:messageConstraint1]; | |
| [centerView addConstraint:messageConstraint2]; | |
| [centerView addConstraint:messageConstraint3]; | |
| [centerView addConstraint:buttonConstraint1]; | |
| [centerView addConstraint:buttonConstraint2]; | |
| [centerView addConstraint:buttonConstraint3]; | |
| [centerView addConstraint:buttonConstraint4]; | |
| [[self view] addConstraint:titleConstraint1]; | |
| [[self view] addConstraint:titleConstraint2]; | |
| [[self view] addConstraint:titleConstraint3]; | |
| [[self view] addConstraint:centerConstraint1]; | |
| [[self view] addConstraint:centerConstraint2]; | |
| [[self view] addConstraint:centerConstraint3]; | |
| [[self view] addConstraint:centerConstraint4]; | |
| [[self view] addConstraint:centerConstraint5]; | |
| [[self view] addConstraint:centerConstraint6]; | |
| [[self view] addConstraint:disclosureContraint1]; | |
| [[self view] addConstraint:disclosureContraint2]; | |
| [[self view] addConstraint:disclosureContraint3]; | |
| [dismissButton addTarget:self action:@selector(dismiss:) forControlEvents:UIControlEventTouchUpInside]; | |
| } |
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