Question

当我在界面构建器中创建具有背景的自定义UIButton时，它为我提供了此默认功能，当我在内部触摸时，它会使图像变黑。如果我以编程方式创建UIButton，如下所示：

    buttonPic = [[UIButton alloc] initWithFrame:CGRectMake(5, 5, 100, 63)];
    [[buttonPic imageView] setContentMode:UIViewContentModeScaleToFill];

[buttonPic setImage:[video pic] forState:UIControlStateNormal];

它的行为与我在IB中创建的行为完全不同。当我在里面触摸时没有任何变化。我错过了UIButton中的设置吗？感谢

Answer 1

这是以编程方式创建UIButton的方法。

//Specify the type of the button first. No need to use alloc-init for UIButton like other view objects.

UIButton *myBtn = [UIButton buttonWithType:UIButtonTypeCustom]; 

// Give UIButtonTypeRoundedRect to get default Interface builder style button. 

myBtn.frame = CGRectMake(0, 0, 100, 40);
[self.view addSubview:myBtn];

 // Since the button type is custom, give an image to make it visible.
[myBtn setBackgroundImage:[UIImage imageNamed:@"image.png"] forState:normal];
[myBtn addTarget:self action:@selector(myAction:) forControlEvents:UIControlEventTouchUpInside];

// These are some optional methods you may want to use.

myBtn.titleLabel.font = [UIFont fontWithName:@"Arial" size:15];
[myBtn setTitle:@"my button" forState:UIControlStateNormal];
[myBtn setTitleColor:[UIColor blackColor] forState:normal];
[myBtn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentCenter];

Answer 2

我认为您必须启用以下两个选项之一：

buttonPic.showsTouchWhenHighlighted = YES;
buttonPic.reversesTitleShadowWhenHighlighted = YES;

UIButton IB vs以编程方式

2 个答案: