Question

我使用UISearchBar进行搜索，使用目标C.我需要搜索栏的占位符文本以编程方式与搜索栏的中心对齐，当用户开始输入时，文本必须左对齐。< / p>

先谢谢

Answer 1

我之前遇到了和你一样的问题。我无法找到任何解决方法，毕竟我只使用了UILabel和UISearchBarDelegate方法。

ViewController.h：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UISearchBarDelegate>

@end

ViewController.m：

#import "ViewController.h"

@interface ViewController () {
    UISearchBar *srchBar;
    UILabel *customPlaceHolderForSearchBar;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    CGRect frm = CGRectMake(0, 0, self.view.frame.size.width, 80);
    srchBar = [[UISearchBar alloc] initWithFrame:frm];
    srchBar.delegate = self;
    [self.view addSubview:srchBar];

    customPlaceHolderForSearchBar = [[UILabel alloc] initWithFrame:frm];
    customPlaceHolderForSearchBar.text = @"PlaceHolder text";
    customPlaceHolderForSearchBar.textColor = [UIColor grayColor];
    customPlaceHolderForSearchBar.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:customPlaceHolderForSearchBar];


}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
    customPlaceHolderForSearchBar.hidden = YES;
}

- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar {
    if (searchBar.text.length < 1) {
        customPlaceHolderForSearchBar.hidden = NO;
    }
}

@end

UISearchBar占位符文本 - 以编程方式与中心对齐

1 个答案: