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
你可以这样做
[btnTwo setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
其他回答
在这之前，我必须根据图像帧大小显式地调整按钮帧的大小。
UIImage *listImage = [UIImage imageNamed:@"list_icon.png"];
UIButton *listButton = [UIButton buttonWithType:UIButtonTypeCustom];
// get the image size and apply it to the button frame
CGRect listButtonFrame = listButton.frame;
listButtonFrame.size = listImage.size;
listButton.frame = listButtonFrame;
[listButton setImage:listImage forState:UIControlStateNormal];
[listButton addTarget:self.navigationController.parentViewController
action:@selector(revealToggle:)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *jobsButton =
[[UIBarButtonItem alloc] initWithCustomView:listButton];
self.navigationItem.leftBarButtonItem = jobsButton;
-(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];
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)
Mike的解决方案将只显示图像，但在按钮上设置的任何标题都将不可见，因为您可以设置标题或图像。
如果你想同时设置(你的图片和标题)，请使用以下代码:
btnImage = [UIImage imageNamed:@"image.png"];
[btnTwo setBackgroundImage:btnImage forState:UIControlStateNormal];
[btnTwo setTitle:@"Title" forState:UIControlStateNormal];
