如何在代码中为 UIButton 设置图像?
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];
但看不到什么会为它设置图像。
Objective-C
UIImage *btnImage = [UIImage imageNamed:@"image.png"];
[btnTwo setImage:btnImage forState:UIControlStateNormal];
斯威夫特 5.1
let btnImage = UIImage(named: "image")
btnTwo.setImage(btnImage , for: .normal)
Mike 的解决方案将只显示图像,但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。
如果您想同时设置(您的图像和标题),请使用以下代码:
btnImage = [UIImage imageNamed:@"image.png"];
[btnTwo setBackgroundImage:btnImage forState:UIControlStateNormal];
[btnTwo setTitle:@"Title" forState:UIControlStateNormal];
在这对我有用之前,我必须根据图像帧大小显式调整按钮框架的大小。
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;
[listButton sizeToFit]
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)
你可以这样做
[btnTwo setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = CGRectMake(0, 0, 150, 44);
[btn setBackgroundImage:[UIImage imageNamed:@"buttonimage.png"]
forState:UIControlStateNormal];
[btn addTarget:self
action:@selector(btnSendComment_pressed:)
forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
您可以以任何一种方式放置图像:
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];
[btnTwo setImage:[UIImage imageNamed:@"name.png"] forState:UIControlStateNormal];
//OR setting as background image
[btnTwo setBackgroundImage:[UIImage imageNamed:@"name.png"]
forState:UIControlStateNormal];
[self.view addSubview:btnTwo];
btnImage = [UIImage imageNamed:@"image.png"];
什么是btnImage?那不在原始代码中。这是一个新按钮吗?
我正在寻找一种将 UIImage
添加到我的 UIButton
的解决方案。问题只是它显示的图像比需要的大。刚刚帮我解决了这个问题:
_imageViewBackground = [[UIImageView alloc] initWithFrame:rectImageView];
_imageViewBackground.image = [UIImage imageNamed:@"gradientBackgroundPlain"];
[self addSubview:_imageViewBackground];
[self insertSubview:_imageViewBackground belowSubview:self.label];
_imageViewBackground.hidden = YES;
每次我想显示我的 UIImageView
时,我只需将 var hidden
设置为 YES
或 NO
。可能还有其他解决方案,但我对这些东西困惑了很多次,这解决了它,我不需要处理 UIButton
在后台做的内部事情。
不用担心从代码中构建按钮,您可以在情节提要上做到这一点。这对我有用,一条线......更简单。
[self.button setBackgroundImage:[UIImage imageNamed: @"yourPic.png"] forState:UIControlStateNormal];
-(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....
}
}
Swift 3 版本(butt_img 必须是 Xcode 中 Assets.xcassets 或 Images.xcassets 文件夹中的图像集):
btnTwo.setBackgroundImage(UIImage(named: "butt_img"), for: .normal)
btnTwo.setTitle("My title", for: .normal)
无论如何,如果您希望缩放图像以填充按钮的大小,您可以在其上添加 UIImageView
并将其分配给您的图像:
let img = UIImageView()
img.frame = btnTwo.frame
img.contentMode = .scaleAspectFill
img.clipsToBounds = true
img.image = UIImage(named: "butt_img")
btnTwo.addSubview(img)
对于迅捷 5+
let image = UIImage(named: "icons-multiply")?.withRenderingMode(.alwaysTemplate)
btn.setImage(image, for: .normal)
不定期副业成功案例分享
setImage
已被弃用的任何地方。 (在我看来,您将UIButton.setImage
与UITableViewCell.image
混淆了,如您所说,UITableViewCell.image
是一个已弃用的属性。)