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;