用UISearchBar中的Activityindicator替换BookmarkButton

问题描述

我使用UISearchBar输入地址以建立网络连接。在建立连接时，我想显示活动指示符，而不是搜索栏右侧的小BookmarkButton。据我所知，没有公开声明的属性可以让我访问搜索栏的正确子视图。我已经看过这个已经完成，有什么想法吗？

I use a UISearchBar for entering an address to establish a network connection. While the connection is made I want to show the activity indicator instead of the tiny BookmarkButton on the right side of the searchbar. As far as I can see there is no public declared property that would give me access to the correct subview of the searchbar. I have seen this been done, any thoughts?

推荐答案

如何用活动指示器替换左侧的搜索图标搜索或连接正在进行中？

How about replacing the search icon on the left side with an activity indicator while searches or connections are in progress?

SearchBarWithActivity.h：

SearchBarWithActivity.h:

#import <UIKit/UIKit.h>

@interface SearchBarWithActivity : UISearchBar

- (void)startActivity;  // increments startCount and shows activity indicator
- (void)finishActivity; // decrements startCount and hides activity indicator if 0

@end

SearchBarWithActivity .m：

SearchBarWithActivity.m:

#import "SearchBarWithActivity.h"

@interface SearchBarWithActivity()

@property(nonatomic) UIActivityIndicatorView *activityIndicatorView;
@property(nonatomic) int startCount;

@end


@implementation SearchBarWithActivity

- (void)layoutSubviews {
    UITextField *searchField = nil;

    for(UIView* view in self.subviews){
        if([view isKindOfClass:[UITextField class]]){
            searchField= (UITextField *)view;
            break;
        }
    }

    if(searchField) {
        if (!self.activityIndicatorView) {
            UIActivityIndicatorView *taiv = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
            taiv.center = CGPointMake(searchField.leftView.bounds.origin.x + searchField.leftView.bounds.size.width/2,
                                      searchField.leftView.bounds.origin.y + searchField.leftView.bounds.size.height/2);
            taiv.hidesWhenStopped = YES;
            taiv.backgroundColor = [UIColor whiteColor];
            self.activityIndicatorView = taiv;
            [taiv release];
            _startCount = 0;

            [searchField.leftView addSubview:self.activityIndicatorView];
        }
    }

    [super layoutSubviews];
}

- (void)startActivity  {
    self.startCount = self.startCount + 1;
}

- (void)finishActivity {
    self.startCount = self.startCount - 1;
}

- (void)setStartCount:(int)startCount {
    _startCount = startCount;
    if (_startCount > 0)
        [self.activityIndicatorView startAnimating];
    else {
        [self.activityIndicatorView stopAnimating];
    }
}

@end

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