UISearchBar 占位符文本 - 以编程方式对齐到中心答案

【问题标题】：UISearchBar placeholder text - align to centre programaticallyUISearchBar 占位符文本 - 以编程方式对齐到中心
【发布时间】：2017-11-29 15:22:39
【问题描述】：

我正在使用 UISearchBar 使用 Objective C 进行搜索。我需要以编程方式将搜索栏的占位符文本对齐到搜索栏的中心，并且当用户开始输入时，文本必须向左对齐。

提前致谢

【问题讨论】：

标签： ios objective-c uisearchbar

【解决方案1】：

我以前也遇到过和你一样的问题。我找不到任何解决方法，毕竟我只是使用了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

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