Question

我认为2个标签，较大的标签和较小的标签只是位于屏幕的中心。更改坐标似乎不会对它们放置的位置产生影响。为什么呢？

理想情况下，我希望它们具有相同的尺寸，不重叠，一个在另一个之下，以便它们几乎覆盖整个屏幕。

我认为labelframe使用的格式 - 起始坐标，大小。我的起源在哪里？在屏幕的左上角？我可以在xcode中翻译吗？

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic, strong) UILabel *label;
@property (nonatomic, strong) UILabel *label1;

@end

@implementation ViewController

- (void)viewDidLoad{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    CGRect labelFrame = CGRectMake(-200.0f,0.0f, 200.0f, 200.0f);
    self.label = [[UILabel alloc] initWithFrame:labelFrame];
    //self.label.adjustsFontSizeToFitWidth = YES;
    self.label.text = @"One two three four five six seven eight nine.";
    self.label.font = [UIFont boldSystemFontOfSize:28.0f];
    self.label.numberOfLines  = 5;
    self.label.center = self.view.center;
    [self.view addSubview:self.label];

    CGRect labelFrame1 = CGRectMake(600.0f,600.0f, 100.0f, 100.0f);
    self.label1 = [[UILabel alloc] initWithFrame:labelFrame1];
    self.label1.text = @"One 1 two three four five six seven eight nine.";
    self.label1.font = [UIFont boldSystemFontOfSize:18.0f];
    self.label1.numberOfLines  = 0;
    self.label1.center = self.view.center;
    [self.view addSubview:self.label1];



}

@end

Answer 1

您正在覆盖拨打电话时设置的来源

self.label.center = self.view.center

Answer 2

Origin 0,0是屏幕 superview的左上角。如果您希望标签位于屏幕中央，一个在另一个上面，您可以执行以下操作：

self.label = [[UILabel alloc] init];
// setup label text, font..
[self.label sizeToFit]; // automatically set the appropriate size
self.label.center = self.view.center;
[self.view addSubview:self.label];

self.label1 = [[UILabel alloc] init];
// setup label text, font..
[self.label sizeToFit]; // automatically set the appropriate size
self.label1.center = self.view.center; // set at center of screen
// just overwrite origin.y to set it below the previous label
self.label1.frame = (CGRect) { self.label1.frame.origin.x, self.label.frame.origin.x + self.label.frame.size.height, self.label1.frame.size };
[self.view addSubview:self.label1];

更新：根据您的评论，让它有两行，一列更容易。只需将框架设置为全宽和半高：

self.label = [[UILabel alloc] initWithFrame:CGrectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height / 2];
self.label1 = [[UILabel alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height / 2, self.view.frame.size.width, self.view.frame.size.height / 2];

如何在ios 6中定位UILabel？

2 个答案: