如何更改Button上的图像集

Question

我想更改按钮点击事件上的按钮图像。这是我正在尝试的。

-(IBAction)editObjectImage:(id)sender
{
    if (editButtonState == NO)
    {   
        [editButton setImage:nil forState:UIControlStateNormal];
        [editButton setImage:[UIImage imageNamed:@"done2.png"] forState:UIControlStateNormal];
    }
    else
    {
        [editButton setImage:nil forState:UIControlStateNormal];
        [editButton setImage:[UIImage imageNamed:@"edit.png"] forState:UIControlStateNormal];
    }
}

但我的按钮图像没有变化。代码有什么问题？

Answer 1

我认为你无法改变editButtonState。您的代码可以缩减为。

-(IBAction)editObjectImage:(id)sender
{
    UIButton *theButton = (UIButton*)sender;
    if (editButtonState == NO) {   
        [theButton setImage:[UIImage imageNamed:@"done2.png"] forState:UIControlStateNormal];
    } else {
        [theButton setImage:[UIImage imageNamed:@"edit.png"] forState:UIControlStateNormal];
    }

    editButtonState = !editButtonState;
}

Answer 2

这是我的工作代码：

NSString *shoppingListButtonImageName = @"notepad-selected";

UIImage *slImage = [UIImage imageNamed:shoppingListButtonImageName];
//put a breakpoint here to check that slImage is not nil.

[self.shoppingListButton setImage:slImage forState:UIControlStateNormal];

Answer 3

点击按钮，你必须像这样设置图像;

[editButton setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateHighlighted];

Answer 4

检查图像是否正确添加（你的[UIImage imageNamed：@“”]）没有返回nil？ ，否则它应该正常工作。