ios - 如何在 UIToolbar 中沿长度分布按钮？

Question

在我的应用程序中，我使用一些代码将带有图像的按钮动态添加到 UIToolbar:

[self.navigationController setToolbarHidden:NO];
UIImage *buttonImage1 = [UIImage imageNamed:@"1.png"];
UIImage *buttonImage2 = [UIImage imageNamed:@"2.png"];
UIImage *buttonImage3 = [UIImage imageNamed:@"3.png"];

UIBarButtonItem *toolButton1 = [[UIBarButtonItem alloc] initWithImage:buttonImage1 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];
UIBarButtonItem *toolButton2= [[UIBarButtonItem alloc] initWithImage:buttonImage2 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];
UIBarButtonItem *toolButton3 = [[UIBarButtonItem alloc] initWithImage:buttonImage3 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];

[self setToolbarItems:[NSArray arrayWithObjects:toolButton1, toolButton2, toolButton3, nil]];

但效果不佳:

如果我尝试设置另一种按钮样式:

toolButton1.style = UIBarButtonSystemItemFlexibleSpace;
toolButton2.style = UIBarButtonSystemItemFlexibleSpace;
toolButton3.style = UIBarButtonSystemItemFlexibleSpace;

它看起来也很差:

我该如何解决这个问题？

Answer 1

添加两个使用系统样式 UIBarButtonSystemItemFlexibleSpace 的附加栏按钮，并在每个现有按钮之间放置一个:

[self.navigationController setToolbarHidden:NO];
UIImage *buttonImage1 = [UIImage imageNamed:@"1"];
UIImage *buttonImage2 = [UIImage imageNamed:@"2"];
UIImage *buttonImage3 = [UIImage imageNamed:@"3"];

UIBarButtonItem *toolButton1 = [[UIBarButtonItem alloc] initWithImage:buttonImage1 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];
UIBarButtonItem *toolButton2= [[UIBarButtonItem alloc] initWithImage:buttonImage2 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];
UIBarButtonItem *toolButton3 = [[UIBarButtonItem alloc] initWithImage:buttonImage3 style:UIBarButtonItemStylePlain target:self action:@selector(btnSettingsClick:)];

[self setToolbarItems:[NSArray arrayWithObjects:
    toolButton1, 
    [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
    toolButton2, 
    [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil],
    toolButton3, 
    nil]];

概念化很奇怪，但灵活空间实际上是一个独特的对象，而不是应用于其他对象的样式。