ios - 取消选择 Segment 的默认值

Question

我正在尝试使用数组加载段控件。当我这样做时，它选择男性作为默认值。我不希望选择男性或女性，默认情况下都未选择。

- (id)initWithAnimal:(ITAnimal *)Animal isEdit:(BOOL)isEdit
{
self = [super init];
if (self) {
    // Custom initialization
    _Animal = Animal;
    _genders = [NSArray arrayWithObjects:@"Male", @"Female", nil];
    if (!_Animal) {
        _Animal = [[ITData sharedObject] managedObjectFromName:@"ITAnimal"];
        _Animal.gender = [_genders objectAtIndex:0];

    }
    _isEdit = isEdit;

    // gender controll
    self.genderControl = [[UISegmentedControl alloc] initWithItems:_genders];
    [self.genderControl addTarget:self action:@selector(genderChanged:) forControlEvents:UIControlEventAllEvents];
    }
    return self;
}





}
else if (indexPath.row == 2) {
    BOOL isIn = NO;
    for (id view in cell.contentView.subviews) {
        if ([view isEqual:self.genderControl]) isIn = YES;
    }
    if (!isIn) [cell.contentView addSubview:self.genderControl];

    [cell.detailTextLabel setHidden:_isEdit];
    [self.genderControl setSelectedSegmentIndex:[_genders indexOfObject:content]];

    [self.genderControl setHidden:!_isEdit];
}

Answer 1

您可能应该使用:

[self.genderControl setSelectedSegmentIndex:UISegmentedControlNoSegment];

From Apple's doc:

The default value is UISegmentedControlNoSegment (no segment selected) until the user touches a segment. Set this property to -1 to turn off the current selection. UISegmentedControl ignores this property when the control is in momentary mode.