iphone - iOS 7 中的 UISearchBar 占位符对齐和裁剪

Question

在 iOS 7 中，UISearchbar 占位符居中对齐并覆盖书签按钮，直到搜索栏未被选中:

当它被选中时，它看起来像预期的那样:

我需要它一直看起来像这样。谢谢。

Answer 1

新解决方案:

//
//  WPViewController.m
//  test
//
//  Created by VASANTH K on 02/01/14.
// 
//

    #import "WPViewController.h"

    @interface WPViewController ()
    {
        UILabel *lableCopy;
    }

    @end

    @implementation WPViewController

    - (void)viewDidLoad
    {
        [super viewDidLoad];
        //[self fixSearchBar:searchBar];
        // Do any additional setup after loading the view, typically from a nib.

        self.searchBar.delegate=self;
    }

    -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {

        [self.searchBar resignFirstResponder];
        //[self fixSearchBar:searchBar];
    }
    -(void)viewDidAppear:(BOOL)animated
    {
        [super viewDidAppear:animated];

        [self fixSearchBar:self.searchBar];

    }

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


    -(void)searchBarTextDidBeginEditing:(UISearchBar *)search
    {
        [self fixSearchBar:self.searchBar];
    }

    -(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
    {
         [self fixSearchBar:self.searchBar];
    }

    -(void)fixSearchBar:(UISearchBar*)searchBar
    {
        UITextField *searchField = [searchBar valueForKey:@"_searchField"];

        // [searchField setValue:[UIColor blueColor] forKeyPath:@"_placeholderLabel.textColor"];

        UILabel *lable=[searchField valueForKey:@"_placeholderLabel"];

        if(!lableCopy)
        {
            lableCopy=[[UILabel alloc]initWithFrame:lable.frame];
            lableCopy.font=lable.font;
            [lableCopy setText:lable.text];
            [lableCopy setTextColor:lable.textColor];
            UIButton *button;

            for (UIView *view in [[[[searchBar.subviews objectAtIndex:0] subviews] objectAtIndex:1] subviews]) {
                if([view isKindOfClass:[UIButton class]])
                {
                    button=(UIButton*)view;
                    break;
                }
            }



            if(button)
            {
                //lable.hidden=YES;
                CGRect newFrame=lable.frame;
                newFrame.size.width=button.frame.origin.x-lable.frame.origin.x;
                lableCopy.frame=newFrame;
                [lableCopy adjustsFontSizeToFitWidth];
                //lableCopy.backgroundColor=[UIColor blackColor];
                [searchField addSubview:lableCopy];
                lableCopy.text=lable.text;
                //lableCopy.textColor=[UIColor redColor];
            }

        }
        for (UIView *view in [[searchBar.subviews objectAtIndex:0] subviews]) {
            if([view isKindOfClass:[UITextField class]])
            {
                // NSLog(@"%@",view);
                NSLog(@"TextFieldPresent==>%@",view);
                if([view isFirstResponder])
                {
                    lable.hidden=NO;
                    lableCopy.hidden=YES;
                }
                else
                {
                    lable.hidden=YES;
                    lableCopy.hidden=NO;
                }
                break;
            }
        }

    }


    @end

此解决方案只是添加新的 UILable View 并隐藏现有占位符以提供 searchBar 的真实感觉。当搜索栏激活时再次重新显示实际占位符。

这可能是修复 IOS7 中的 UI 问题的临时 hack。

旧的解决方案: [searchField setValue:[NSNumber numberWithBool:YES] forKeyPath:@"_placeholderLabel.adjustsFontSizeToFitWidth"];

在 ios7 中不起作用，因为用于显示内容的标签大小足以显示文本，问题是 ios7 的标签宽度错误。它无法重新调整标签宽度。

有一些 hack 可以解决这个问题。

UITextField *searchField = [searchBar valueForKey:@"_searchField"];


    UILabel *lable=[searchBar valueForKey:@"_placeholderLabel"];
    lable.font=[UIFont fontWithName:lable.font.fontName size:10.0];

根据您自己的搜索栏宽度计算字体大小。我也试图改变特定标签的宽度，但它从来没有奏效。