UIButton UIBarButtonItem用法

 #pragma mark 快速创建一个item

 - (UIBarButtonItem *)itemWithNormal:(NSString *)normal highlighted:(NSString *)highlighted selector:(SEL)selector {

     // 初始化按钮

     UIButton *button = [[[UIButton alloc] init] autorelease];

       button.title.font = [UIFont systemFontOfSize:10];
     // 设置按钮背景图片

     UIImage *normalImg = [UIImage imageNamed:normal];

     UIImage *highlightedImg = [UIImage imageNamed:highlighted];

     button.bounds = CGRectMake(, , normalImg.size.width, normalImg.size.height);

     [button setBackgroundImage:normalImg forState:UIControlStateNormal];

     [button setBackgroundImage:highlightedImg forState:UIControlStateHighlighted];

     // 监听按钮点击

     [button addTarget:self action:selector forControlEvents:UIControlEventTouchUpInside];

     // 初始化item

     return [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];

 }

 // 设置左边

 self.navigationItem.leftBarButtonItem = [self itemWithNormal:@"left.png" 
   highlighted:@"leftHigh.png" selector:@selector(send)];

 // 设置右边

 self.navigationItem.rightBarButtonItem = [self itemWithNormal:@"right.png" 
   highlighted:@"rightHigh.png" selector:@selector(refresh)];

 // 设置cell的背景色

  UIView *bg = [[[UIView alloc] init] autorelease];

  bg.backgroundColor = [UIColor colorWithRed:0.95 green:0.95 blue:0.95 alpha:];

   cell.backgroundView = bg;

 // 设置cell选中的背景

 UIView *selectdBg = [[[UIView alloc] init] autorelease];

 selectdBg.backgroundColor = [UIColor colorWithRed:0.85 green:0.85 blue:0.85 alpha:];

 cell.selectedBackgroundView = selectdBg;

 //设置按钮的标题和颜色

 [btn setNormalBg:@"normal.png" andHightlighted:@"highlight.png"];

 [btn setTitle@"title" forState:UIControlStateNormal];

 [btn setTitleColor:[UIColor balckColor] forState:UIControlStateNormal];

UIButton *button = [[[UIButton alloc] init] autorelease];
//字体大小

button.title.font = [UIFont systemFontOfSize:];

//自动对齐

button.title.textAlignment = NSTextAlignmentCenter;

//设置背景图片

[button setBackgroundImage:[UIImage resizeImage:@"image.png"] forState:UIControlStateNormal];

 UIButton *btn = [[UIButton alloc] init];

 UIImage *imageNormal = [UIImage imageNamed:"@image.png"];

 [btn setBackgroundImage:imageNormal forState:UIControlStateNormal];

 UIImage *highLight = [UIImage imageNamed:"@high.png"];

 [btn setBackgroundImage:imageNormal forState:UIControlStateHighlighted];

 UIBarButtonItem *item = [[[UIBarButtonItem alloc] initWithCustomView:btn] autorelease];

 viewController.navigationItem.rightBarButtonItem = item;