如何在不使用Interface构建器的情况下创建一个简单的按钮

Question

如何在不使用Interface builder的情况下创建一个简单的按钮?

Answer 1

你需要像这样声明一个UIButton:

UIButton *newButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 80, 40)];
[newButton setTitle:@"Some Button" forState:UIControlStateNormal];

然后将按钮添加到视图中-

[self.view addSubview: newButton]; // (could be another view other then self.view)

最后，如果你想在按下按钮时发生一些动作，你可以添加:

[newButton  addTarget:self action:@selector(doSomething)
     forControlEvents:UIControlEventTouchUpInside];

并声明函数:

- (void) doSomething
{
       NSLog(@"Button pressed");
}

当然别忘了松开按钮

Answer 2

试试

UIButton *playButton = [[UIButton buttonWithType:UIButtonTypeRoundedRect];
playButton.frame = CGRectMake(110.0, 360.0, 100.0, 30.0);
[playButton setTitle:@"Play" forState:UIControlStateNormal];
playButton.backgroundColor = [UIColor clearColor];
[playButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal ];
UIImage *buttonImageNormal = [UIImage imageNamed:@"blueButton.png"];
UIImage *strechableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[playButton setBackgroundImage:strechableButtonImageNormal forState:UIControlStateNormal];
UIImage *buttonImagePressed = [UIImage imageNamed:@"whiteButton.png"];
UIImage *strechableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];
[playButton setBackgroundImage:strechableButtonImagePressed forState:UIControlStateHighlighted];
[playButton addTarget:self action:@selector(playAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:playButton];

Answer 3

像这样-

自定义按钮-

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 30.0f)];

系统按钮-

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];