背景: 因为我用的 UIPickerView最多只有三个cell，并且还是动态加载的，当只有一个cell的时候UIPickerView的didSelectRow这个选择代理方法就不起作用了，只能在上面放一个Button，但是问题来了，这个Button居然不能接受到点击事件
1.创建一个PickerView
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| - (UIPickerView *)selectPickView{
if (_selectPickView == nil) {
_selectPickView = [[UIPickerView alloc]init];
_selectPickView.delegate = self;
_selectPickView.dataSource = self;
_selectPickView.showsSelectionIndicator = YES;
_selectPickView.backgroundColor = [UIColor whiteColor];
_selectPickView.showsSelectionIndicator = YES;
}
return _selectPickView;
}
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2.并遵守其代理
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| @interface JoinConferenceView()<UIPickerViewDelegate,UIPickerViewDataSource>{
}
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3. 相关代理方法
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| - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{
return 44.0;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return _pickDataArray.count;
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
UIButton *button;
if (view == nil) {
view = [[UIView alloc]init];
view.backgroundColor = [UIColor clearColor];
view.userInteractionEnabled = YES;
if (!button) {
button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(0, 0, pickerView.bounds.size.width, 44.0);
[button setTitle:_pickDataArray[row] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(pickButtonAction:) forControlEvents:UIControlEventTouchDown];
button.tag = 1000 + row;
[view addSubview:button];
}
}
return view;
}
//这里硬是触发不了
- (void)pickButtonAction:(UIButton *)button{
[_selectPickView selectRow:button.tag - 1000 inComponent:0 animated:YES];
_passCodeTextField.text = _pickDataArray[button.tag - 1000];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
_passCodeTextField.text = _pickDataArray[row];
}
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4.后来用Reveal看了一下UI，原来是PickerView的cell挡住了
5.所以，现在只能用重写 hitTest:
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| //防止PickerView的cell遮挡Button的点击事件
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
id view = [super hitTest:point withEvent:event];
if ([view isKindOfClass:[HWJoinConferenceView class]]) {//防止点击到HWJoinConferenceView,引起无限递归
return nil;
}
return [view hitTest:[self convertPoint:point toView:view] withEvent:event];
}
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