[英]iPhone center activity indicator regardless of screen orientation
無論屏幕方向如何,我如何以編程方式居中設置活動指示器?
嘗試設置活動視圖的center
屬性,如下所示:
activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
在viewDidLoad
,注冊設備輪換的通知:
- (void)viewDidLoad {
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification object:nil];
}
並實現didRotate:
-(void)didRotate:(NSNotification *)notification {
if (activity) {
activity.center = CGPointMake(self.view.frame.size.width/2,self.view.frame.size.height/2);
}
}
我建議你使用https://github.com/jdg/MBProgressHUD這是一個很棒的庫,用於做各種“加載”屏幕。
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