《精通 iOS 开发》第 05 章学习笔记

单个控制器的旋转支持

代码示例:

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- (NSUInteger)supportedInterfaceOrientations {
return (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight);
}

代码调整界面布局

在界面构造器中,将Use Autolayout复选框取消选中。

旋转时移动按钮

代码示例:

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- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
[self doLayoutForOrientation:toInterfaceOrientation];
}

- (void)doLayoutForOrientation:(UIInterfaceOrientation)orientation {
if (UIInterfaceOrientationIsPortrait(orientation)) {
[self layoutPortrait];
} else {
[self layoutLandscape];
}
}

static const CGFloat buttonHeight = 40;
static const CGFloat buttonWidth = 120;
static const CGFloat spacing = 20;

- (void)layoutPortrait {
CGRect b = self.view.bounds;

CGFloat contentWidth = CGRectGetWidth(b) - (2 * spacing);
CGFloat contentHeight = CGRectGetHeight(b) - (4 * spacing) - (2 * buttonHeight);

self.contentView.frame = CGRectMake(spacing, spacing, contentWidth, contentHeight);

CGFloat buttonRow1y = contentHeight + (2 * spacing);
CGFloat buttonRow2y = buttonRow1y + buttonHeight + spacing;

CGFloat buttonCol1x = spacing;
CGFloat buttonCol2x = CGRectGetWidth(b) - buttonWidth - spacing;

self.actionButton1.frame = CGRectMake(buttonCol1x, buttonRow1y, buttonWidth, buttonHeight);
self.actionButton2.frame = CGRectMake(buttonCol2x, buttonRow1y, buttonWidth, buttonHeight);
self.actionButton3.frame = CGRectMake(buttonCol1x, buttonRow2y, buttonWidth, buttonHeight);
self.actionButton4.frame = CGRectMake(buttonCol2x, buttonRow2y, buttonWidth, buttonHeight);
}

- (void)layoutLandscape {
CGRect b = self.view.bounds;

CGFloat contentWidth = CGRectGetWidth(b) - buttonWidth - (3 * spacing);
CGFloat contentHeight = CGRectGetHeight(b) - (2 * spacing);

self.contentView.frame = CGRectMake(spacing, spacing, contentWidth, contentHeight);

CGFloat buttonX = CGRectGetWidth(b) - buttonWidth - spacing;
CGFloat buttonRow1y = spacing;
CGFloat buttonRow4y = CGRectGetHeight(b) - buttonHeight - spacing;

CGFloat buttonRow2y = buttonRow1y + floor((buttonRow4y - buttonRow1y) * 0.333);
CGFloat buttonRow3y = buttonRow1y + floor((buttonRow4y - buttonRow1y) * 0.667);

self.actionButton1.frame = CGRectMake(buttonX, buttonRow1y, buttonWidth, buttonHeight);
self.actionButton2.frame = CGRectMake(buttonX, buttonRow2y, buttonWidth, buttonHeight);
self.actionButton3.frame = CGRectMake(buttonX, buttonRow3y, buttonWidth, buttonHeight);
self.actionButton4.frame = CGRectMake(buttonX, buttonRow4y, buttonWidth, buttonHeight);
}

获取视图加载完后的屏幕方向

代码示例:

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- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIApplication *app = [UIApplication sharedApplication];
UIInterfaceOrientation currentOrientation = app.statusBarOrientation;
[self doLayoutForOrientation:currentOrientation];
}
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