Iphone 如何禁用部分UISegmentedControl？

以下是

UISegmentedControl

UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects: [UIImage imageNamed:@"down.png"], [UIImage imageNamed:@"dList.png"], nil]];  

[segmentedControl addTarget:self action:@selector(segmentAction:) forControlEvents:UIControlEventValueChanged];  
segmentedControl.frame = CGRectMake(0, 0, 90, 65);  
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;  
segmentedControl.momentary = YES;  

UIBarButtonItem *segmentBarItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];  

[segmentedControl release];  

self.navigationItem.rightBarButtonItem = segmentBarItem;  

[segmentBarItem release];    

及

- (void)segmentAction:(id)sender{
    if([sender selectedSegmentIndex] == 0)
    {
        button.hidden=NO;
    }
    else
    {
        [self dListMethod ];
    }
}

---

在if（）部分，我想禁用

selectedSegmentIndex==0

并在

按钮时启用。hidden=YES

使用

setEnabled:forSegmentAtIndex:

方法启用和禁用段

[segmentedControl setEnabled:NO forSegmentAtIndex:0];

---

如果要禁用第一段。

对于那些可能对swift命令感兴趣的人：

Swift 2.3

segmentedControl.setEnabled(false , forSegmentAtIndex: 0);

self.segmentedControl.setEnabled(false, forSegmentAt: 0);

Swift 3

segmentedControl.setEnabled(false , forSegmentAtIndex: 0);

self.segmentedControl.setEnabled(false, forSegmentAt: 0);

---

如果（[sender selectedSegmentIndex]==0）执行if

button.hidden=NO

，您不希望该行执行吗？