objective-c - UIButton IB 与编程方式

Question

当我在界面构建器中创建一个带有背景的自定义 UIButton 时，它会给我这个默认功能，当我在内部进行修饰时，它会把图像涂黑。 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 中创建的完全不同。当我触摸里面时，什么都没有改变。 UIButton 中是否有我缺少的设置？ 谢谢

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];