如何更改UISearchBar占位符和图像色调颜色？

如果您有可以使用的自定义图像，则可以使用类似于以下内容的方式设置图像并更改占位符文本颜色：

[searchBar setImage:[UIImage imageNamed:@"SearchWhite"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];UITextField *searchTextField = [searchBar valueForKey:@"_searchField"];    if ([searchTextField respondsToSelector:@selector(setAttributedPlaceholder:)]) {    UIColor *color = [UIColor purpleColor];    [searchTextField setAttributedPlaceholder:[[NSAttributedString alloc] initWithString:@"Search" attributes:@{NSForegroundColorAttributeName: color}]];}

在该示例中，我使用了PurpleColor，而是可以使用该

+ (UIColor *)colorWithRed:(CGFloat)redgreen:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha

编辑：我刚刚意识到你正在迅速写它…嗯。快速输入答案，这样我就不会只把答案留在Obj-C中了。

    searchBar.setImage(UIImage(named: "SearchWhite"), forSearchBarIcon: UISearchBarIcon.Search, state: UIControlState.Normal);    var searchTextField: UITextField? = searchBar.valueForKey("searchField") as? UITextField    if searchTextField!.respondsToSelector(Selector("attributedPlaceholder")) {        var color = UIColor.purpleColor()        let attributeDict = [NSForegroundColorAttributeName: UIColor.purpleColor()]        searchTextField!.attributedPlaceholder = NSAttributedString(string: "search", attributes: attributeDict)    }

斯威夫特3.0

    var searchTextField: UITextField? = searchBar.value(forKey: "searchField") as? UITextField    if searchTextField!.responds(to: #selector(getter: UITextField.attributedPlaceholder)) {        let attributeDict = [NSForegroundColorAttributeName: UIColor.white]        searchTextField!.attributedPlaceholder = NSAttributedString(string: "Search", attributes: attributeDict)    }