IOS学习（四）UIButton

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];

//初始化时，同时设置样式
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(100, 100, 200, 50);
[button setBackgroundColor:[UIColor greenColor]];
[button setTitle:@"点我啊" forState:UIControlStateNormal];
[button setTitle:@"算你狠" forState:UIControlStateHighlighted];

//此种方式拉升所有区域，导致.9图片失效
//    [button setBackgroundImage:[UIImage imageNamed:@"1"] forState:UIControlStateNormal];

//设置不被拉升的区域，左5 顶5
[button setBackgroundImage:[[UIImage imageNamed:@"1"] stretchableImageWithLeftCapWidth:5 topCapHeight:5] forState:UIControlStateNormal];

[button setImage:[UIImage imageNamed:@"3"] forState:UIControlStateNormal];
//填充模式
button.imageView.contentMode = UIViewContentModeScaleAspectFit;

[self.view addSubview:button];
}