UIButton 应用选择状态（附：UIButton 常用状态）

NSString * path = [[NSBundle mainBundle]pathForResource:@"alien" ofType:@"png"];
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:path];
    NSString* path2 = [[NSBundle mainBundle]pathForResource:@"spider" ofType:@"png"];
    UIImage * image2 =[[UIImage alloc]initWithContentsOfFile:path2];
//创建两张图片
    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    [button setBackgroundImage:image forState:UIControlStateNormal];//设置正常状态
    [button setBackgroundImage:image2 forState:UIControlStateSelected];//设置选择状态
    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
//添加事件
   
    button.adjustsImageWhenHighlighted = FALSE;
    [self.view addSubview:button];


-(void)click:(id)sender
{
UIButton *u = (UIButton *)sender;
u.selected = YES;//选择状态设置为YES,如果有其他按钮 先把其他按钮的selected设置为NO，
}




UIButton状态:
UIControlStateNormal          // 正常状态   
UIControlStateHighlighted     // 高亮状态   
UIControlStateDisabled        // 禁用状态    
UIControlStateSelected        // 选中状态    
UIControlStateApplication     //     
UIControlStateReserved        // 保留状态
 
UIButton类型:
UIButtonTypeCustom            //自定义类型
添加图片：   灰色背景颜色：
UIButtonTypeRoundedRect       //圆角类型


UIButtonTypeDetailDisclosure   //细节展示按钮


UIButtonTypeInfoLight          //浅色背景的信息按钮


UIButtonTypeInfoDark           //暗色背景的信息按钮


UIButtonTypeContactAdd         // 添加按钮


 
创建UIButton
1. UIButton *button = [[UIButton alloc] initWithFrame: CGRectMake (x, y, Width, Height)];    
 
2. UIButton *button = [[UIButton buttonWithType:UIButtonTypeCustom] retain];  
 
设置UIButton标题
[button setTitle:title forState:UIControlStateNormal];    
 
设置UIButton标题颜色
[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
 
设置UIButton背景图片
[button setBackgroundImage:newImage forState:UIControlStateNormal];
 
设置UIButton背景颜色
button.backgroundColor = [UIColor clearColor];