=）

for (UIView *subView in _searchBar.subviews) {
    for(id field in subView.subviews){
        if ([field isKindOfClass:[UITextField class]]) {
            UITextField *textField = (UITextField *)field;
            [textField setBackgroundColor:[UIColor grayColor]];
        }
    }
}

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看看函数：

[searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"search_bar"] forState:UIControlStateNormal];

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在Swift 2和iOS 9中，您可以调用：

UITextField.appearanceWhenContainedInInstancesOfClasses([UISearchBar.self]).backgroundColor = UIColor.darkGrey()

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Swift 3：

UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).backgroundColor = UIColor.darkGrey()

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Swift 3中的解决方案：

if let txfSearchField = searchController.searchBar.value(forKey: "_searchField") as? UITextField {
        txfSearchField.borderStyle = .none
        txfSearchField.backgroundColor = .lightGray
}

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以swift4中的扩展为例：

extension UISearchBar {

    var input : UITextField? {

        return findInputInSubviews(of: self)
    }

    func findInputInSubviews(of view: UIView) -> UITextField? {
        guard view.subviews.count > 0 else { return nil }
        for v in view.subviews {
            if v.isKind(of: UITextField.self) {
                return v as? UITextField
            }
            let sv = findInputInSubviews(of: v)
            if sv != nil { return sv }
        }
        return nil
    }
}

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使用方法：

searchBar?.input?.layer.borderColor = color.cgColor

型