UIButton 例子
UICatalog例子
例子中得方法:

+ (UIButton *)buttonWithTitle:    (NSString *)title                                target:(id)target                                selector:(SEL)selector                                frame:(CGRect)frame                                image:(UIImage *)image                                imagePressed:(UIImage *)imagePressed                                darkTextColor:(BOOL)darkTextColor{        UIButton *button = [[UIButton alloc] initWithFrame:frame];    // or you can do this:    //        UIButton *button = [[UIButton buttonWithType:UIButtonTypeCustom] retain];    //        button.frame = frame;        button.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;    button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;        [button setTitle:title forState:UIControlStateNormal];        if (darkTextColor)    {        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    }    else    {        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];    }        UIImage *newImage = [image stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];    [button setBackgroundImage:newImage forState:UIControlStateNormal];        UIImage *newPressedImage = [imagePressed stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];    [button setBackgroundImage:newPressedImage forState:UIControlStateHighlighted];        [button addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];        // in case the parent view draws with a custom color or gradient, use a transparent color    button.backgroundColor = [UIColor clearColor];            return button;}

- (void)createGrayButton{        // create the UIButtons with various background images    // white button:    UIImage *buttonBackground = [UIImage imageNamed:@"whiteButton.png"];    UIImage *buttonBackgroundPressed = [UIImage imageNamed:@"blueButton.png"];        CGRect frame = CGRectMake(0.0, 0.0, kStdButtonWidth, kStdButtonHeight);        grayButton = [ButtonsViewController buttonWithTitle:@"Gray"                                target:self                                selector:@selector(action:)                                frame:frame                                image:buttonBackground                                imagePressed:buttonBackgroundPressed                                darkTextColor:YES];}