赞
踩
说在前面
最近针对公司项目进行了iPad的适配,发现了很多有关屏幕旋转的适配,发现了一些有趣的问题.
UIcollectionView在屏幕旋转的过程中,没有进行自动适配,也就是旋转的过程中,collectionView的UIcollectionViewDelegateFlowLayout并没有重新出发调用.
解决方案:页面添加屏幕旋转通知,判断有效旋转后,刷新页面,调用invalidateLayout.
代码附上:
extension UIcollectionView { // 刷新数据 func safeReloadData() { CATransaction.begin() CATransaction.setDisableActions(true) self.reloadData() CATransaction.commit() } // 重新布局 func safeLayoutInvalidateLayout() { CATransaction.begin() CATransaction.setDisableActions(true) self.collectionViewLayout.invalidateLayout() CATransaction.commit() } }
下面是基于BaseView写的,其中判断,项目需求,只有iPad支持倒屏状态.
子类中,需要屏幕旋转的,设置isOpenDeviceOrientationObserver为YES就行,子类实现ktx_deviceOrientationDidChange方法即可
代码中,判断的是有效屏幕的旋转,也就是横屏和竖屏的旋转,对平放等不做考虑,如果你的项目需要,则另行修改.
#import <UIKit/UIKit.h> NS_ASSUME_NONNULL_BEGIN @interface TTBaseView : UIView /// 开启屏幕旋转通知 @property (nonatomic, assign) BOOL isOpenDeviceOrientationObserver; // 屏幕旋转 - (void)ktx_deviceOrientationDidChange; @end NS_ASSUME_NONNULL_END #import "TTBaseView.h" #import "UIDevice+TTDevice.h" @interface TTBaseView() // 是不是水平 @property (nonatomic, assign) BOOL reocrdIsLaunch; @end @implementation TTBaseView @synthesize isOpenDeviceOrientationObserver = _isOpenDeviceOrientationObserver; - (instancetype)init { if (self = [super init]) { UIDevice *device = [UIDevice currentDevice] ; self.reocrdIsLaunch = (device.orientation == UIDeviceOrientationLandscapeLeft) || (device.orientation == UIDeviceOrientationLandscapeRight); } return self; } - (void)awakeFromNib { [super awakeFromNib]; UIDevice *device = [UIDevice currentDevice] ; self.reocrdIsLaunch = (device.orientation == UIDeviceOrientationLandscapeLeft) || (device.orientation == UIDeviceOrientationLandscapeRight); } - (void)dealloc { [self setIsOpenDeviceOrientationObserver:NO]; } - (void)setIsOpenDeviceOrientationObserver:(BOOL)isOpenDeviceOrientationObserver { BOOL oldValue = self.isOpenDeviceOrientationObserver; if (oldValue == isOpenDeviceOrientationObserver) { return; } _isOpenDeviceOrientationObserver = isOpenDeviceOrientationObserver; if (_isOpenDeviceOrientationObserver) { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object:nil]; } else { [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil]; } } - (void)deviceOrientationDidChange { //1.获取 当前设备 实例 UIDevice *device = [UIDevice currentDevice] ; BOOL is_need_update= NO; switch (device.orientation) { case UIDeviceOrientationPortraitUpsideDown: if (![UIDevice isPad]) { break; } case UIDeviceOrientationPortrait: if (self.reocrdIsLaunch) { is_need_update = YES; self.reocrdIsLaunch = NO; } break; case UIDeviceOrientationLandscapeLeft: case UIDeviceOrientationLandscapeRight: if (!self.reocrdIsLaunch) { is_need_update = YES; self.reocrdIsLaunch = YES; } break; default: // NSLog(@"无法辨识"); break; } if (is_need_update) { [self ktx_deviceOrientationDidChange]; } } - (void)ktx_deviceOrientationDidChange { }
这个问题其实比较常见,这个也是屏幕旋转的的问题.
涉及到屏幕旋转,有关UICollectionView的itemsize的计算,获取到的数值会不准确,会受到屏幕旋转的延迟影响,也就是说,当页面已经转过来后,itemsize的获取还是原屏幕状态的值.
有关UICollectionView的itemsize的计算, 不要取collectionView.width or self.view,
获取当前屏幕的宽度或者高度,:[[UIApplication sharedApplication].delegate window].width
ps:直接写出来.width or .height 自己写个view的分类
UITableView是属于列表类型,所以,默认的宽度是根据屏幕进行自动适配的,高度不会,所以针对cell的子元素的换行的高度还需要特殊处理.
上面提到的屏幕旋转的问题,基本上也同样适用于UITableView.
Copyright © 2003-2013 www.wpsshop.cn 版权所有,并保留所有权利。