[英]Getting UITableViewCell with superview in iOS 7
我得到的UITutView屬於UIButton屬於這樣:
-(void)buttonHandler:(UIButton *)button {
OrderCell *cell = [[button superview] superview];
NSLog(@"cell.item = %@", cell.item.text);
在iOS 7之前它可以正常工作。但是給了我:
[UITableViewCellScrollView item]:無法識別的選擇器發送到實例0x17ae2cf0
如果我在iOS 7中運行該應用程序。但如果我這樣做:
-(void)buttonHandler:(UIButton *)button {
OrderCell *cell = [[[button superview] superview] superview];
NSLog(@"cell.item = %@", cell.item.text);
然后它可以在iOS 7中運行,但不是更早???!?!
我這樣做是在繞過這個問題:
OrderCell *cell;
if([[[UIDevice currentDevice] systemVersion] isEqualToString:@"7.0"])
cell = [[[button superview] superview] superview];
else
cell = [[button superview] superview];
NSLog(@"cell.item = %@", cell.item.text);
但是WTF還在繼續!? 有誰知道為什么會這樣?
謝謝!
更好的解決方案是為UIView(SuperView)添加一個類別,並通過以下方式調用它:
UITableViewCell *cell = [button findSuperViewWithClass:[UITableViewCell class]]
這樣,您的代碼適用於所有未來和過去的iOS版本
@interface UIView (SuperView)
- (UIView *)findSuperViewWithClass:(Class)superViewClass;
@end
@implementation UIView (SuperView)
- (UIView *)findSuperViewWithClass:(Class)superViewClass {
UIView *superView = self.superview;
UIView *foundSuperView = nil;
while (nil != superView && nil == foundSuperView) {
if ([superView isKindOfClass:superViewClass]) {
foundSuperView = superView;
} else {
superView = superView.superview;
}
}
return foundSuperView;
}
@end
最好的方法是:
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonPosition];
UITableViewCell *cell = (UITableViewCell*)[self.tableView cellForRowAtIndexPath:indexPath];
要完成@ thomas-keuleers的答案,這是一個快速的方法:
extension UIView {
func findSuperViewWithClass<T>(superViewClass : T.Type) -> UIView? {
var xsuperView : UIView! = self.superview!
var foundSuperView : UIView!
while (xsuperView != nil && foundSuperView == nil) {
if xsuperView.self is T {
foundSuperView = xsuperView
} else {
xsuperView = xsuperView.superview
}
}
return foundSuperView
}
}
而你只是這樣打電話:
child.findSuperViewWithClass(TableViewCell)
swift 5中的較短版本
extension UIView {
var xsuperView = self.superview
while xsuperView != nil {
if let superView = xsuperView.self as? T {
return superView
} else {
xsuperView = xsuperView?.superview
}
}
}
if ([[button superView] isKindOfClass:[UITableViewCell class]]) {
}
else //check next :
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