objective-c 制作 UIButton 复选框的最佳方法是什么？
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What is the best way to make a UIButton checkbox?
提问by cduck
I am trying to make a standard check box for my iPhone app from a UIButtonwith a title and image. The button image changes between an "unchecked" image and a "checked" image.
我正在尝试为我的 iPhone 应用程序创建一个UIButton带有标题和图像的标准复选框。按钮图像在“未选中”图像和“选中”图像之间变化。
At first I tried subclassing UIButtonbut UIButtonhas no -init***method to use in my -initmethod.
起初我尝试了子类化，UIButton但在我的方法中UIButton没有-init***方法可以使用-init。
What is the best way to do this?
做这个的最好方式是什么？
Thanks in advance.
提前致谢。
回答by Jasarien
You shouldn't need to subclass the UIButtonclass. By design, Objective-C favors composition over inheritance.
您不应该需要对类进行子UIButton类化。按照设计，Objective-C 更喜欢组合而不是继承。
UIButtonis a subclass of UIControl, which has a selectedproperty. You can use this property to toggle the on/off behaviour of a checkbox, just the same way a UISwitchdoes.
UIButton是 的子类UIControl，它有一个selected属性。您可以使用此属性来切换复选框的开/关行为，就像 aUISwitch一样。
You can attach an action to the button's touched up inside event, and perform the toggling in there, something like this:
您可以将一个动作附加到按钮的触摸内部事件，并在那里执行切换，如下所示：
// when you setup your button, set an image for the selected and normal states
[myCheckBoxButton setImage:checkedImage forState:UIControlStateSelected];
[myCheckBoxButton setImage:nonCheckedImage forState:UIControlStateNormal];
- (void)myCheckboxToggle:(id)sender
{
myCheckboxButton.selected = !myCheckboxButton.selected; // toggle the selected property, just a simple BOOL
}
回答by emp
Set the images in the button:
在按钮中设置图像：
[button setImage:uncheckedImage forState:UIControlStateNormal]
[button setImage:checkedImage forState:UIControlStateSelected]
Now all you need to do is:
现在你需要做的就是：
button.selected = state
and the correct images will display.
并会显示正确的图像。
回答by chown
All you need to do is set 2 different images for the states UIControlStateNormaland UIControlStateSelected, then in your selector, changed the selectedproperty of the button.
所有你需要做的是设置2幅不同的图像的状态UIControlStateNormal和UIControlStateSelected，然后在你的选择，改变了selected按钮的属性。
Here is a working example (replace image names with your own):
这是一个工作示例（用您自己的图像名称替换图像名称）：
- (void)loadView {
// ...
UIButton *chkBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[chkBtn setFrame:CGRectMake(0, 0, 300, 25)];
[chkBtn setImage:[UIImage imageNamed:@"UNCHECKED.png"]
forState:UIControlStateNormal];
[chkBtn setImage:[UIImage imageNamed:@"CHECKED.png"]
forState:UIControlStateSelected];
[chkBtn addTarget:self
action:@selector(chkBtnHandler:)
forControlEvents:UIControlEventTouchUpInside];
// Optional title change for checked/unchecked
[chkBtn setTitle:@"I am NOT checked!"
forState:UIControlStateNormal];
[chkBtn setTitle:@"I am checked!"
forState:UIControlStateSelected];
[self.view addSubview:chkBtn];
[chkBtn release], chkBtn = nil;
// ...
}
- (void)chkBtnHandler:(UIButton *)sender {
// If checked, uncheck and visa versa
[sender setSelected:!sender isSelected];
}
回答by Brayden
For anyone interested in the future - instead of doing it yourself just download the link below from GitHub and it has it subclassed from UIControl already and functions perfectly as a checkbox. Also includes a sample project on how easy it is to use:
对于对未来感兴趣的任何人 - 而不是自己做，只需从 GitHub 下载下面的链接，它已经从 UIControl 子类化，并且可以完美地用作复选框。还包括一个关于它是多么容易使用的示例项目：
回答by neoneye
I have used M13Checkbox in one of my projects. Works ok.
我在我的一个项目中使用了 M13Checkbox。工作正常。
回答by Gank
UIImage* nonCheckedImage=[UIImage imageNamed:@"ic_check_box_outline_blank_grey600_48dp.png"];//[UIImage init
UIImage* CheckedImage=[UIImage imageNamed:@"ic_check_box_black_48dp.png"];//[UIImage init
//ic_check_box_black_48dp.png
[_checkBox setImage:CheckedImage forState:UIControlStateSelected];
[_checkBox setImage:nonCheckedImage forState:UIControlStateNormal];
}
- (IBAction)checkBoxToggle:(id)sender {
_checkBox.selected = !_checkBox.selected; // toggle the selected property, just a simple BOOL
}
the image you can use google icon
您可以使用谷歌图标的图像
回答by King
Try this:-
尝试这个：-
-(IBAction)clickCheckButton:(UIButton *)sender {
if (sender.tag==0) {
sender.tag = 1;
[sender setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
}else
{
sender.tag = 0;
[sender setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal]; } } sender.tag = 0;
[sender setImage:[UIImage imageNamed:@"uncheck.png"] forState:UIControlStateNormal];
}
}
回答by Jeff R
Why not use a switch - UISwitch? This is used to display an element showing the boolean state of a value.
为什么不使用开关 - UISwitch？这用于显示显示值的布尔状态的元素。
回答by willcodejavaforfood
Did you try overriding the initWithCoder method, just in case it is loaded from a nib somehow?
您是否尝试覆盖 initWithCoder 方法，以防万一它以某种方式从笔尖加载？
