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一、問題描述
通過以下設(shè)置在ios13之前有效，在ios13之后會造成設(shè)置字體大小失效，

for (UIView *subView in [[searchBar.subviews lastObject] subviews]) {
            if ([[subView class] isSubclassOfClass:[UITextField class]]) {
                UITextField *textField = (UITextField *)subView;
                textField.font = [UIFont systemFontOfSize:14];
                _searchTextField = textField;
                break;
            }
 }

因為打印searchBar.subviews.lastObject.subviews在ios13之前：
<__NSArrayM 0x2818fc210>(
<UISearchBarBackground: 0x1064f6160; frame = (0 0; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x281617240>>,
<UISearchBarTextField: 0x10681e000; frame = (0 0; 0 0); text = ''; opaque = NO; layer = <CALayer: 0x2816145e0>>
)
在ios13之后:
<__NSArrayM 0x282d96940>(
<UISearchBarBackground: 0x1063c5500; frame = (0 0; 0 0); userInteractionEnabled = NO; layer = <CALayer: 0x282300f00>>,
<_UISearchBarSearchContainerView: 0x1063c5920; frame = (0 0; 0 0); autoresize = W; gestureRecognizers = <NSArray: 0x282d76d30>; layer = <CALayer: 0x282301400>>
)

所以if里面的設(shè)置不再執(zhí)行。

二、解決方法

在ios13之后UISearchBar暴露了UITextField屬性，這點算是蘋果的優(yōu)化，方便取了，但是你搞下兼容啊......

現(xiàn)在如下設(shè)置：
if (@available(iOS 13.0, *)) {
        UITextField *tf = searchBar.searchTextField;
        tf.font = [UIFont systemFontOfSize:14];
    } else {
        for (UIView *subView in [[searchBar.subviews lastObject] subviews]) {
            if ([[subView class] isSubclassOfClass:[UITextField class]]) {
                UITextField *textField = (UITextField *)subView;
                textField.font = [UIFont systemFontOfSize:14];
                _searchTextField = textField;
                break;
            }
        }
    }