使用自定义类以编程方式创建 UIButton

Question

我想以编程方式创建 3-4 个按钮，但要使用自定义类和特定的值/键对，但我很难准确地做到这一点。 我要创建的按钮必须有一个名为“AnswerButton”的自定义类。添加一个 UIButton.tag 应该不是问题，所以我可以准确地知道点击了哪个按钮，对吧？

这是我用来创建按钮的代码：

NSMutableArray *catNames;
catNames = [NSMutableArray arrayWithCapacity:5];
[catNames addObject:@"Boote"];
[catNames addObject:@"Gewässer"];
[catNames addObject:@"Technik"];
[catNames addObject:@"Krims Krams"];

[self dynamiclyCreateButtons:4 :catNames];

- (void)dynamiclyCreateButtons:(int)howMany :(NSMutableArray*)catNames {
    float standard_btnHeight = 30.0;
    float standard_btnWidth = 200.0;
    CGFloat p = 120;

    for(int i = 0; i != howMany; i++){
        UIButton *catBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [catBtn setFrame:CGRectMake(0.0f, 0.0f, standard_btnWidth, standard_btnHeight)];
        [catBtn setCenter:CGPointMake(100.0f, p)];
        [catBtn setTitle:[catNames objectAtIndex:i] forState:UIControlStateNormal];
        [catBtn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:catBtn];
        p=p+40;
        catBtn = nil;
    }
}

//编辑 我所说的自定义类是什么意思： https://i.stack.imgur.com/8r2oz.png

//编辑2（正确答案，因为我无法自己发布答案以更好地指出）

只是在这里指出并更容易找到答案：Greg 的回答是正确的。 您不应该使用默认类创建按钮，而是使用您的自定义类：

替换

UIButton *catBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

与

AnswerButton *catBtn = [AnswerButton buttonWithType:UIButtonTypeRoundedRect];

别忘了导入类！

Answer 1

试试这个...

-(void)dynamiclyCreateButtons:(int)howMany :(NSMutableArray*)catNames {
    float standard_btnHeight = 30.0;
    float standard_btnWidth = 200.0;
    CGFloat p = 120;


    for(int i = 0; i != howMany; i++){
        UIButton *catBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [catBtn setFrame:CGRectMake(0.0f, 0.0f, standard_btnWidth, standard_btnHeight)];
        [catBtn setCenter:CGPointMake(100.0f, p)];
        [catBtn setTag:i];
        [catBtn setTitle:[catNames objectAtIndex:i] forState:UIControlStateNormal];
        [catBtn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:catBtn];
        p=p+40;
        catBtn = nil;
    }
}
- (IBAction)buttonClicked:(id)sender
{
    NSLog(@"Button.Tag = %d",[sender tag]);
}

编辑：如果你想使用自定义类，你必须创建一个继承自UIButton 的类。然后在你的视图控制器中导入这个类。

之后将UIButton 替换为YourCustomButton like..

YourCustomButton *catBtn = [YourCustomButton buttonWithType:UIButtonTypeRoundedRect];