不用太担心从代码中构造按钮，你可以在故事板中完成。这对我很管用，一句台词……更简单。

[self.button setBackgroundImage:[UIImage imageNamed: @"yourPic.png"] forState:UIControlStateNormal];

你可以把图像放在两种方式中的任何一种:

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];

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。

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)

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) 

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];