如何为 iPhone 创建一个带有黑色渐变的 UIButton?

问题描述

我想在 iOS 中创建一个带有普通黑色渐变主题的 UIButton.我查看了文档，似乎无法弄清楚如何做到这一点.创建按钮时，我得到一个没有颜色的圆角矩形按钮.

I want to create a UIButton with the normal black gradient theme in iOS. I've looked at the documentation and can't seem to figure out how to do this. When I create the button, I get a rounded rect button with no color.

这是我的代码:

UIButton* leagueTeamButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

关于如何向按钮添加标准主题黑色渐变有什么建议吗?

Any suggestions on how I can add the standard themed black gradient to the button?

推荐答案

在 Photoshop 或任何图像处理软件中制作一个(或两个，如果您希望按下时改变外观)并放入项目的资源文件夹中，使用以下代码将图像添加为 UIButton:

Make one (or two, if you want it change appearance when press down) in Photoshop - or any image processing software - and put into your project's resource folder, use the following code to add the image as a UIButton:

UIButton *yourButton=[UIButton buttonWithType:UIButtonTypeCustom];
[yourButton setFrame:CGRectMake(0,0,10,10)];
[yourButton addTarget:self action:@selector(functionYouWantToCall:) forControlEvents:UIControlEventTouchUpInside];

[yourButton setImage:[UIImage imageNamed:@"imageNormalState.png"] forState:UIControlStateNormal];
[yourButton setImage:[UIImage imageNamed:@"imageWhenPressDown.png"] forState:UIControlStateHighlighted]; // option if you want to display another image (i.e. darker one) when user press the button

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