iOS13适配总结

1.UINavigationBar 设置按钮边距导致崩溃

- (void)layoutSubviews {
    [super layoutSubviews];
    
    for (UIView *subview in self.subviews) {
        if ([NSStringFromClass([subview class]) containsString:@"_UINavigationBarContentView"]) {
            if ([UIDevice currentDevice].systemVersion.floatValue >= 13.0) {
                UIEdgeInsets margins = subview.layoutMargins;
                subview.frame = CGRectMake(-margins.left, -margins.top, margins.left + margins.right + subview.frame.size.width, margins.top + margins.bottom + subview.frame.size.height);
            } else {
                subview.layoutMargins = UIEdgeInsetsZero;
            }
            break;
        }
     }
}

2.取消深色模式

在info.plist中添加（key:User Interface Style   
            value:Light）关闭深色模式

3.模态弹出样式

设置弹出控制器modalPresentationStyle为 UIModalPresentationFullScreen类型。

4.私有方法 KVC 不允许访问

例：UITextField
原
[moneyTextField setValue:kRGB(0x2F3242) forKeyPath:@"_placeholderLabel.textColor"];
改为：
moneyTextField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"" attributes:@{NSForegroundColorAttributeName: kRGB(0x2F3242)}];

5.UITextField类leftview、rightView展示异常

问题：将UILabel、UIImageView类对象赋值给leftview时，展示大小为UILabel、UIImageView内容宽高，而不是设置的frame大小
解决：将UILabel、UIImageView类对象包一层UIView再赋值给leftView。

6.UIWebView 将被禁止提交审核