如何以编程方式生成 n 个 UILabel 并添加到 View？

Question

我是 iOS 开发的新手。

我的目标是：

1. 生成N个UILabels

   UILabel *label0 = [[UILabel alloc]init]

   UILabel *label1 = [[UILabel alloc]init]

   ...

   UILabel *label n = [[UILabel alloc]init];

2. 使用 addSubView 将每个 UILabel 添加到 View

为了生成N个UILabels（如果我做错了请纠正我），我在viewcontroller.h中声明了NSMutableDictionay

@property (strong,nonatomic)NSMutableDictionary *uiLabelsDictionary;

在 viewcontroller.m 中

self.uiLabelsDictionary = [[NSMutableDictionary alloc]init];

int yOffset = 40;

for(int i=0;i<10;i++)
{
    yOffset = yOffset+40;
    [self.uiLabelsDictionary setObject:[[UILabel alloc]initWithFrame:CGRectMake(10, yOffset, self.view.frame.size.width, self.view.frame.size.width)] forKey:[NSString stringWithFormat:@"label%d",i]];
}

NSLog(@"%@",self.uiLabelsDictionary);

我被困在下一步了。如何将字典中存储的每个 UILabel 读取为 UILabel 并添加到视图中？

字典输出

label0 = "<UILabel: 0x7f83dbd08ba0; frame = (10 80; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x608000090680>>";
label1 = "<UILabel: 0x7f83dbc0f7b0; frame = (10 120; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008e240>>";
label2 = "<UILabel: 0x7f83dbc15570; frame = (10 160; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008e4c0>>";
label3 = "<UILabel: 0x7f83dbc159a0; frame = (10 200; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008e5b0>>";
 label4 = "<UILabel: 0x7f83dbc15c30; frame = (10 240; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008e790>>";
 label5 = "<UILabel: 0x7f83dbc16040; frame = (10 280; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008ebf0>>";
 label6 = "<UILabel: 0x7f83dbc162d0; frame = (10 320; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008ef10>>";
 label7 = "<UILabel: 0x7f83dbc16560; frame = (10 360; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008e510>>";
 label8 = "<UILabel: 0x7f83dbc167f0; frame = (10 400; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008ec40>>";
 label9 = "<UILabel: 0x7f83dbc16a80; frame = (10 440; 320 320); userInteractionEnabled = NO; layer = <_UILabelLayer: 0x60800008f460>>";

Answer 1

使用数组。

@property (nonatomic, strong) NSArray *labels;

和

NSMutableArray *labels = [NSMutableArray array];

for (int i=0; i<10; i++) {
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 80+i*40, self.view.frame.size.width, self.view.frame.size.width)];
    [self.view addSubview:label]; // Add the label to the view
    [labels addObject:label]; // Keep track of the labels
}
self.labels = labels;

NSLog(@"%@", labels);

// Later on...
UILabel *label0 = self.labels[0]; // Get a reference to label 0

Answer 2

只需这样做 --

int yOffset = 40;

for(int i=0;i<10;i++) {
    yOffset = yOffset+40;
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, yOffset, self.view.frame.size.width, 30)];
    label.tag = i; //You can access any label by using tag
    [self.view addSubView:label];
}

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如果你想滚动页面，那么只需使用 UITableView