Objective-C for循环设置变量文本值

Question

我有两件事似乎应该很容易,我认为它们很容易,但这是我的第一个Objective-C程序,所以它不像我在我的本地Perl那样容易找到我.这两个例子几乎相同,但我在想,因为一个人使用@synthesize它可能会有很大不同.

例1

// What Works
@synthesize display0 = _display0;
@synthesize display1 = _display1;
@synthesize display2 = _display2;
@synthesize display3 = _display3;

// What I would like to do:
for (int i=0; i<4; i++)
{
    @synthesize display$i = _display$i;
}

例2

// Works
- (IBAction)clearPressed
{
    self.display0.text = @"0";
    self.display1.text = @"0";
    self.display2.text = @"0";
    self.display3.text = @"0";
}

// What I would like to see
- (IBAction)clearPressed
{
    for (int i=0; i<4; i++) {
        self.display$i.text = @"0";
    }
}

让我走向正确方向的任何帮助都会很棒!

Answer 1

如果您正在使用UILabel,请尝试这样做:

@property (nonatomic, retain) IBOutletCollection(UILabel) NSArray *valueFields;


- (IBAction)clearPressed
{
    for(UILabel *label in valueFields)
    {
        label.text = @"0";
    }
}

Answer 2

只需使用IBOutletCollection:

@property (strong) IBOutletCollection(UILabel) NSArray *labels;

然后你可以使用快速枚举循环它:

UILabel *label;
for (label in labels) {
    label.text = @"0";
}