无法更改UIBarButtonItem的图像

我试图改变一个UIBarButtonItem的图像一旦按下，没有任何运气的各种方法。无法更改UIBarButtonItem的图像

// bookmarkButton is a property linked up in IB 
-(IBAction)bookmarkButtonTapped:(id)sender 
{ 
NSLog(@"this action triggers"); 
// attempt 1 
UIBarButtonItem* aBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"bookmarkdelete.png"] style:UIBarButtonItemStylePlain target:self action:@selector(bookmarkButtonTapped:)]; 
bookmarkButton = aBarButtonItem; 
[aBarButtonItem release]; 

// attempt 2 
bookmarkButton.image = [UIImage imageNamed:@"bookmarkdelete.png"]; 
}

是否有另一种方法可以做到这一点？

来源

2010-11-22 cannyboy

工具栏包含数组 - 项目 - 作为一个属性。因此，在设置工具栏作为一个IBOutlet属性之后，我不得不插入一个新的按钮到该阵列..像这样：

NSMutableArray *items = [[NSMutableArray alloc] initWithArray:self.toolBar.items]; 
UIBarButtonItem *newButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"newButton.png"] style:UIBarButtonItemStylePlain target:self action:@selector(buttonTapped:)]; 
[items replaceObjectAtIndex:0 withObject:newButton]; 
self.toolBar.items = items; 
[newButton release]; 
[items release];

来源

2010-11-25 15:24:34 cannyboy

bookmarkButton是一个UIButton吗？是否应通过(UIButton *)aBarButtonItem.customView而不是直接引用？

如果它是一个UIButton，那么你就需要设置基于状态的图像：- (void)setImage:(UIImage *)image forState:(UIControlState)state

注意，也有setBackgroundImage用相同的API，如果你想要的吧。

来源

2010-11-22 14:55:13

bookmarkButton是的UIBarButtonItem在成立笔尖。 – cannyboy 2010-11-22 15:03:03

-3

尝试[bookmarkButton setImage:[UIImage imageNamed:@"bookmarkdelete.png"] forState:UIControlStateNormal];

来源

2010-11-22 14:55:50

我得到一个错误'UIBarButtonItem'可能无法响应-setImage：forState：'当我尝试。 – cannyboy 2010-11-22 15:01:41

这应该工作

UIImage *normalButtonImage = [UIImage imageNamed:@"TableViewIcon"]; 
UIImage *selectedButtonImage = [UIImage imageNamed:@"CollectionViewIcon"]; 
CGRect rightButtonFrame = CGRectMake(0, 0, normalButtonImage.size.width, 
            normalButtonImage.size.height); 
UIButton *rightButton = [[UIButton alloc] initWithFrame:rightButtonFrame]; 
[rightButton setBackgroundImage:normalButtonImage forState:UIControlStateNormal]; 
[rightButton setBackgroundImage:selectedButtonImage forState:UIControlStateSelected]; 
[rightButton addTarget:self action:@selector(toggleTableView:) 
     forControlEvents:UIControlEventTouchDown]; 
self.toggleMediaView = [[UIBarButtonItem alloc] initWithCustomView:rightButton]; 
[self.navigationItem setLeftBarButtonItem:self.toggleMediaView]; 
self.navigationItem.leftBarButtonItem.enabled = NO;

来源

2016-02-01 19:09:05

无法更改UIBarButtonItem的图像

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