從UIView到UIViewController？是否有一個內置的方法可以從UIView向其UIViewController？我知道你可以從UIViewController向其UIView通孔[self view]但我想知道是否有反向引用？
3 回答
繁星淼淼
TA貢獻1775條經驗 獲得超11個贊
@interface UIView (FindUIViewController)- (UIViewController *) firstAvailableUIViewController;- (id) traverseResponderChainForUIViewController;
@end@implementation UIView (FindUIViewController)- (UIViewController *) firstAvailableUIViewController {
// convenience function for casting and to "mask" the recursive function
return (UIViewController *)[self traverseResponderChainForUIViewController];}- (id) traverseResponderChainForUIViewController {
id nextResponder = [self nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return nextResponder;
} else if ([nextResponder isKindOfClass:[UIView class]]) {
return [nextResponder traverseResponderChainForUIViewController];
} else {
return nil;
}}@end// from a UIView subclass... returns nil if UIViewController not available UIViewController * myController = [self firstAvailableUIViewController];
隔江千里
TA貢獻1906條經驗 獲得超10個贊
UIViewUIResponder. UIResponder-nextRespondernil. UIViewUIResponderUIView-nextResponder
@interface UIView (APIFix)- (UIViewController *)viewController;@end@implementation UIView (APIFix)- (UIViewController *)viewController {
if ([self.nextResponder isKindOfClass:UIViewController.class])
return (UIViewController *)self.nextResponder;
else
return nil;}@endUIView
- 3 回答
- 0 關注
- 431 瀏覽
添加回答
舉報
0/150
提交
取消