如何在代码中设置UIButton的图像?
我有这个:
UIButton *btnTwo = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btnTwo.frame = CGRectMake(40, 140, 240, 30);
[btnTwo setTitle:@"vc2:v1" forState:UIControlStateNormal];
[btnTwo addTarget:self action:@selector(goToOne) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btnTwo];
但不知道什么会为它设置图像。
当前回答
如果是Swift用户
// case of normal image
let image1 = UIImage(named: "your_image_file_name_without_extension")!
button1.setImage(image1, forState: UIControlState.Normal)
// in case you don't want image to change when "clicked", you can leave code below
// case of when button is clicked
let image2 = UIImage(named: "image_clicked")!
button1.setImage(image2, forState: UIControlState.Highlight)
其他回答
我正在寻找一个解决方案，添加一个UIImage到我的UIButton。问题是它显示的图像比需要的大。刚刚帮了我这个
_imageViewBackground = [[UIImageView alloc] initWithFrame:rectImageView];
_imageViewBackground.image = [UIImage imageNamed:@"gradientBackgroundPlain"];
[self addSubview:_imageViewBackground];
[self insertSubview:_imageViewBackground belowSubview:self.label];
_imageViewBackground.hidden = YES;
每次我想要显示我的UIImageView时，我只需要将var隐藏为YES或NO。 可能有其他的解决方案，但我对这个东西感到困惑了很多次，这个解决了它，我不需要处理UIButton在后台做的内部东西。
如果是Swift用户
// case of normal image
let image1 = UIImage(named: "your_image_file_name_without_extension")!
button1.setImage(image1, forState: UIControlState.Normal)
// in case you don't want image to change when "clicked", you can leave code below
// case of when button is clicked
let image2 = UIImage(named: "image_clicked")!
button1.setImage(image2, forState: UIControlState.Highlight)
Swift 3版本(butt_img必须是Image Set into Assets。xcassets或图像。xcassets文件夹在Xcode):
btnTwo.setBackgroundImage(UIImage(named: "butt_img"), for: .normal)
btnTwo.setTitle("My title", for: .normal)
无论如何，如果你想让图像缩放到按钮的大小，你可以在它上面添加一个UIImageView，并给它分配你的图像:
let img = UIImageView()
img.frame = btnTwo.frame
img.contentMode = .scaleAspectFill
img.clipsToBounds = true
img.image = UIImage(named: "butt_img")
btnTwo.addSubview(img)
-(void)buttonTouched:(id)sender
{
UIButton *btn = (UIButton *)sender;
if( [[btn imageForState:UIControlStateNormal] isEqual:[UIImage imageNamed:@"icon-Locked.png"]])
{
[btn setImage:[UIImage imageNamed:@"icon-Unlocked.png"] forState:UIControlStateNormal];
// other statements....
}
else
{
[btn setImage:[UIImage imageNamed:@"icon-Locked.png"] forState:UIControlStateNormal];
// other statements....
}
}
你可以这样做
[btnTwo setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
