Question

我一直在努力自动化创建UI元素的某些方面，并创建了这个似乎有用的方法：

    - (void) viewDidLoad
        {
            [super viewDidLoad];
            button = [self createButton:button xPos:30 yPos:100 width:100 height:30  caption:@"autoButton" textPos:NSTextAlignmentCenter textClr:[UIColor blackColor] backClr:[UIColor yellowColor]];
            [self.view addSubview: button];
        }

    - (UIButton *) createButton:(UIButton *)control xPos:(CGFloat)x yPos:(CGFloat)y width:(CGFloat)width height:(CGFloat)height caption:(NSString *)caption textPos:(NSTextAlignmentCenter)textPosition textClr:(UIColor *)textColor backClr:(UIColor *)backColor
        {
            control = [[UIButton alloc] initWithFrame: CGRectMake(x, y, width, height)];
            [control setTitle:caption forState:UIControlStateNormal];
            control.titleLabel.textAlignment = textPosition;
            control.backgroundColor = backColor;
            [control setTitleColor: textColor forState:UIControlStateNormal];
            return control;
        }

此实施有什么不对吗？
不是使用方法，是否可以用简单的旧函数实现相同的功能？如果必须指出参数名称， xPos：30 yPos：100宽度：100高度：100等等
，这有点啰嗦。

很高兴能够做到这样的事情：

button = createButton(30, 100, 100, 30, @"autoButton", NSTextAlignmentCenter, [UIColor blackColor], [UIColor yellowColor]);

这可行吗？

Answer 1

很好，除了传递button参数没有意义。只需返回UIButton对象。

- (void) viewDidLoad
    {
        [super viewDidLoad];
        button = [self createButtonWithxPos:30 yPos:100 width:100 height:30  caption:@"autoButton" textPos:NSTextAlignmentCenter textClr:[UIColor blackColor] backClr:[UIColor yellowColor]];
        [self.view addSubview: button];
    }

- (UIButton *) createButtonWithxPos:(CGFloat)x yPos:(CGFloat)y width:(CGFloat)width height:(CGFloat)height caption:(NSString *)caption textPos:(NSTextAlignmentCenter)textPosition textClr:(UIColor *)textColor backClr:(UIColor *)backColor
    {
        UIButton *control = [[UIButton alloc] initWithFrame: CGRectMake(x, y, width, height)];
        [control setTitle:caption forState:UIControlStateNormal];
        control.titleLabel.textAlignment = textPosition;
        control.backgroundColor = backColor;
        [control setTitleColor: textColor forState:UIControlStateNormal];
        return control;
    }

好的，使用功能或方法。由你决定。只要您不需要self，就可以使用一个函数。

UIButton *createButton(CGFloat x, CGFloat y, CGFloat width, CGFloat height, NSString *caption, NSTextAlignmentCenter textPosition, UIColor *textColor, UIColor *backColor) {
    UIButton *control = [[UIButton alloc] initWithFrame: CGRectMake(x, y, width, height)];
    [control setTitle:caption forState:UIControlStateNormal];
    control.titleLabel.textAlignment = textPosition;
    control.backgroundColor = backColor;
    [control setTitleColor: textColor forState:UIControlStateNormal];
    return control;
}

- (void) viewDidLoad
    {
        [super viewDidLoad];
        button = createButton(30, 100, 100, 30, @"autoButton", NSTextAlignmentCenter, [UIColor blackColor], [UIColor yellowColor]);
        [self.view addSubview: button];
    }

Answer 2

您可以使用Objective-c 中的内置功能类别：
1。Apple documentary for customising classes
2。Categories tutorial

在Objective-C中以编程方式创建UI元素

2 个答案: