如何判斷UIViewController的視圖是否可見我有一個選項卡應用程序，有很多視圖。有沒有辦法知道UIViewController當前在UIViewController？(尋找財產)
3 回答
桃花長相依
TA貢獻1860條經驗 獲得超8個贊
if (viewController.isViewLoaded && viewController.view.window) {
// viewController is visible}if viewController.viewIfLoaded?.window != nil {
// viewController is visible}
qq_笑_17
TA貢獻1818條經驗 獲得超7個贊
以下是@progrmr的解決方案UIViewController類別：
// UIViewController+Additions.h
@interface UIViewController (Additions)
- (BOOL)isVisible;
@end
// UIViewController+Additions.m
#import "UIViewController+Additions.h"
@implementation UIViewController (Additions)
- (BOOL)isVisible {
return [self isViewLoaded] && self.view.window;
}
@end
森欄
TA貢獻1810條經驗 獲得超5個贊
UISplitViewController
if(viewController.isViewLoaded && viewController.view.window) {
//Always true for master view in split view controller}- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
//We are now invisible
self.visible = false;}- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
//We are now visible
self.visible = true;}- 3 回答
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