Question

我是Xcode和objective-c的新手，我尝试制作一个应用程序，导航菜单可以显示保存在MySQL数据库中的所有者的个人资料图片。我用导航栏按钮但似乎不能使用UIViewImage作为按钮。这是我的代码：

//Resize image
   UIImage *miniProfile=[UIImage imageNamed:@"profile_icon.png"];//this is the hardcoded version
   UIImage *tempImage = nil;
   CGSize targetSize = CGSizeMake(25,25);
   UIGraphicsBeginImageContext(targetSize);
   CGRect thumbnailRect = CGRectMake(0, 0, 0, 0);
   thumbnailRect.origin = CGPointMake(0.0,0.0);
   thumbnailRect.size.width  = targetSize.width;
   thumbnailRect.size.height = targetSize.height;
   [miniProfile drawInRect:thumbnailRect];
   tempImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();

   //Automatically change image to circle view
   UIImageView *roundProfile = [[UIImageView alloc] initWithImage:tempImage];
   roundProfile.backgroundColor = [UIColor clearColor];
   roundProfile.layer.cornerRadius = miniProfile.size.width/2;
   roundProfile.layer.masksToBounds = YES;
   [self.view addSubview: roundProfile];

   //Add image to navigation bar. However button cannot be clicked
   UIBarButtonItem * profileImage = [[UIBarButtonItem alloc] initWithCustomView:roundProfile];

   //Create two button on right navigation bar. One for image the other for real button
   NSArray *profilebarButton = @[profileImage];
   self.navigationItem.rightBarButtonItems = profilebarButton;

我能够将UIImageView放在导航栏中，但我遇到了两个问题： 1.）如果图像大于30x30，则图像不会出现，表示调整大小不起作用。 2.）我无法点击图片，需要创建另一个按钮来处理这个

Answer 1

您可以将此代码用于自定义导航栏按钮

self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:UITextAttributeTextColor];

//create the button and assign the image
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"btn_next_arrow_01.png"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"btn_next_arrow_02.png"] forState:UIControlStateHighlighted];
button.adjustsImageWhenDisabled = NO;


//set the frame of the button to the size of the image (see note below)
button.frame = CGRectMake(0, 0, 30, 30);

[button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

//create a UIBarButtonItem with the button as a custom view
UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.leftBarButtonItem = customBarItem;
self.navigationItem.hidesBackButton = YES;

将UIImageView插入导航栏按钮

1 个答案: