关于初始化navigationbar的返回按钮

之前这样写的，发现触摸区域太小 ，经常出现点击不到的情况：

    UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0,0,29,25)];

    

    UIImage *backImage = [UIImage imageNamed:@"fhan.png"];

//    UIImage *backImageP = [UIImage imageNamed:@"fhan.png"];

    

    UIButton *tmpBackButton = [UIButton buttonWithType:UIButtonTypeCustom];

    tmpBackButton.showsTouchWhenHighlighted = NO;

    

    [tmpBackButton setImage:backImage forState:UIControlStateNormal];

//    [tmpBackButton setImage:backImageP forState:UIControlStateHighlighted];

    

    tmpBackButton.frame = CGRectMake(0, 0,29, 25);

    [tmpBackButton setExclusiveTouch:YES];

    [tmpBackButton addTarget:self action:@selector(handleBackEvent)

            forControlEvents:UIControlEventTouchUpInside];

    [leftView addSubview:tmpBackButton];

    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:leftView];

    self.navigationItem.leftBarButtonItem = backButtonItem;

    [backButtonItem release];

    [leftView release];

后来改成这样后就好了：

 UIImage *backImage = [UIImage imageNamed:@"fhan.png"];

    //    UIImage *backImageP = [UIImage imageNamed:@"fhan.png"];

    

    UIButton *tmpBackButton = [UIButton buttonWithType:UIButtonTypeCustom];

    tmpBackButton.showsTouchWhenHighlighted = NO;

    

    [tmpBackButton setImage:backImage forState:UIControlStateNormal];

    //    [tmpBackButton setImage:backImageP forState:UIControlStateHighlighted];

    

    tmpBackButton.frame = CGRectMake(0, 0,29, 25);

    [tmpBackButton setExclusiveTouch:YES];

    [tmpBackButton addTarget:self action:@selector(handleBackEvent)

            forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:tmpBackButton];

    self.navigationItem.leftBarButtonItem = backButtonItem;

    [backButtonItem release];