objective-c - 在没有重复代码的情况下，对 Storyboard中的一堆控件执行相同的操作

Question

我在 Storyboard上有 3 种控件类型(bigButton0....bigButton11、btnSmall0...btnSmall11 和 lbl0...lbl11)。

我想将相同的图像分配给所有 btnBig0 到 btnBig11。 我目前正在使用冗长的冗余代码来执行此操作，因为我没有找到任何更智能的解决方案，但我需要在运行时执行此操作。

有人可以告诉我如何缩短我的代码吗？ 非常感谢。

NSString * sImageName = [NSString stringWithFormat:@"button_bg_%.0f_%.0f_normal.png", L_CELL_W, L_CELL_H];

[bigButton0 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton1 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton2 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton3 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton4 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton5 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton6 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton7 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton8 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton9 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton10 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];
[bigButton11 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateNormal];

sImageName = [NSString stringWithFormat:@"button_bg_%.0f_%.0f_down.png", L_CELL_W, L_CELL_H];

[bigButton0 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton1 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton2 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton3 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton4 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton5 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton6 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton7 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton8 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton9 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton10 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];
[bigButton11 setImage:[UIImage imageNamed:sImageName] forState:UIControlStateHighlighted];

Answer 1

有很多方法可以缩短这段代码。一种是使用 IBOutletCollection。给你的 View Controller 一个实例变量，它是一个集合类型，如 NSArray，并将其注释为 UIButton 的 IBOutletCollection:

@implementation MyViewController {
    IBOutletCollection(UIButton) NSArray *bigButtons;
}
...

如果您愿意，可以在您的公共(public)接口(interface)或 .m 文件的类扩展中将其设为属性:

#import "MyViewController.h"

// Class extension at the top of MyViewController.m
@interface MyViewController ()
@property (nonatomic, strong) IBOutletCollection(UIButton) NSArray *bigButtons;
@end

// Normal class @implementation comes after the class extension
@implementation MyViewController
...

现在，在 Interface Builder 中，您可以将这个 socket 集合连接到所有大按钮。然后您可以在代码中迭代集合:

NSString * sImageName = [NSString stringWithFormat:@"button_bg_%.0f_%.0f_normal.png", L_CELL_W, L_CELL_H];
UIImage *normalImage = [UIImage imageNamed:sImageName];
sImageName = [NSString stringWithFormat:@"button_bg_%.0f_%.0f_down.png", L_CELL_W, L_CELL_H];
UIImage *highlightedImage = [UIImage imageNamed:sImageName];

for (UIButton *button in bigButtons) {
    [button setImage:normalImage forState:UIControlStateNormal];
    [button setImage:highlightedImage forState:UIControlStateHighlighted];
}

为每种类型的按钮重复(使用单独的集合 ivar)。