如何以編程方式為Bar-Button項設置動作Objective-C

Question

使用以下代碼實現了一些按鈕，

UISegmentedControl *button = [[[UISegmentedControl alloc] initWithItems:
    [NSArray arrayWithObjects:@"", nil]] autorelease];
button.momentary = YES;
button.segmentedControlStyle = UISegmentedControlStyleBar;

UIBarButtonItem *barButton = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];

我使用此代碼為按鈕設置了操作

[button addTarget:self 
           action:@selector(drawOnImageByColor:) 
 forControlEvents:UIControlEventTouchUpInside];

Answer 1

像這樣改變

[button addTarget:self 
           action:@selector(drawOnImageByColor:) 
 forControlEvents:UIControlEventValueChanged];

Answer 2

使用此代碼

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(drawOnImageByColor:)];
self.navigationItem.rightBarButtonItem = rightButton;
[rightButton release];

Answer 3

您必須設置要添加為自定義視圖的按鈕的操作。