关于iOS7的版本适配问题(从iOS9向iOS7适配)
版本适配的原因在于🍎总是会更新它的API去代替老的一些API,但是又不能直接把老的摈弃掉,于是给我们这些开发人员带来了一个很严重的问题是做到版本适配,让app能在不同机型下都能运行。最近我了解了一些部分常见的适配,分享下下。
1:对于两个日期的判断,分别适用于iOS8以下和iOS8以上,
-(NSDateComponents *)components:(NSCalendarUnit)unitFlags fromDate:(NSDate *)startingDate toDate:(NSDate *)resultDate options:(NSCalendarOptions)opts;
-(NSComparisonResult)compareDate:(NSDate *)date1 toDate:(NSDate *)date2 toUnitGranularity:(NSCalendarUnit)unit NS_AVAILABLE(10_9, 8_0);
2:对于UIAlertController弹出框的适配,因为其是在iOS8以后出现的,因此在iOS8以前系统的手机我们需要做些改变,可以有UIAlertView和UIActionSheet代替使用
self.datePicker.datePickerMode = UIDatePickerModeDate; UIActionSheet* startsheet = [[UIActionSheet alloc] initWithTitle:@"\n\n\n\n\n\n\n\n\n\n\n\n" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"确定", @"取消", nil]; startsheet.tag = 333; //添加子控件的方式也是直接添加 [startsheet addSubview:self.datePicker]; [startsheet showInView:self.view];
效果图如下:
3:个人觉得最难解决的问题是横竖屏的适配问题iOS7以后横屏后view的frame会跟着改变,问题不是很大,但是iOS7以前的就不是这么回事,最近很苦恼,有一些经验之谈,比如横屏改变当前Controller视图View的frame可以通过设置frame为视图view.Bounds
还有就是两个监听屏幕改变的方法进行设置,如下
#pragma mark - rotation Notifies - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{ [_scrollView setFrame:self.view.bounds]; } - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ [_scrollView setFrame:self.view.bounds]; NSLog(@"监听:didRotateFromInterfaceOrientation %ld,now bounds:%@,%@,",(long)fromInterfaceOrientation,NSStringFromCGRect(self.view.bounds),NSStringFromCGRect(self.view.frame)); }
最后给大家一个小功能,快速切换横竖屏,代码献上
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) { 2 SEL selector = NSSelectorFromString(@"setOrientation:"); 3 NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]]; 4 [invocation setSelector:selector]; 5 [invocation setTarget:[UIDevice currentDevice]]; 6 UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation]; 7 int val = interfaceOrientation == UIInterfaceOrientationPortrait ? UIInterfaceOrientationLandscapeRight : UIInterfaceOrientationPortrait; 8 [invocation setArgument:&val atIndex:2]; 9 [invocation invoke]; 10 }