ios - 是否可以更改 UISearchBar 占位符的对齐方式？

Question

由于输入语言不同，我将需要以不同的对齐方式显示 UISearchBar。
我看到了这个答案，但我找不到你实际将文本与UISearchBar.

有任何想法吗？
谢谢！

Answer 1

这就是我所做的：

for (UIView *subView in self.subviews){
        if ([subView isKindOfClass:[UITextField class]]) {
            UITextField *text = (UITextField*)subView;
            text.textAlignment = UITextAlignmentRight;
            text.rightViewMode = UITextFieldViewModeAlways;
        }
    }

如果您还想移动放大镜图标，可以这样做：

text.leftView = nil;
text.rightView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"search_icon.png"]];

但是您必须提供 search_icon.png 图像。

Answer 2

这是解决方案

UITextField *searchTextField = [searchBar valueForKey:@"_searchField"];
UILabel *placeholderLabel = [searchTextField valueForKey:@"_placeholderLabel"];
[placeholderLabel setTextAlignment:NSTextAlignmentLeft];

Answer 3

要设置属性占位符文本以实现左对齐占位符，请尝试此代码...

//Step1 : Make blank attributed string
NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:@""];

//Step2 : Append placeholder to blank attributed string
NSString *strSearchHere = @"Search here...";
NSDictionary * attributes = [NSDictionary dictionaryWithObject:[UIColor blackColor] forKey:NSForegroundColorAttributeName];
NSAttributedString * subString = [[NSAttributedString alloc] initWithString:strSearchHere attributes:attributes];
[attributedString appendAttributedString:subString];

//Step3 : Append dummy text to blank attributed string
NSString *strLongText = @"LongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongTextLongText";
NSDictionary * attributesLong = [NSDictionary dictionaryWithObject:[UIColor clearColor] forKey:NSForegroundColorAttributeName];
NSAttributedString * subStringLong = [[NSAttributedString alloc] initWithString:strLongText attributes:attributesLong];
[attributedString appendAttributedString:subStringLong];

//Step4 : Set attributed placeholder string to searchBar textfield
UITextField *searchTextField = [searchBarr valueForKey:@"_searchField"];
searchTextField.attributedPlaceholder = attributedString;
searchTextField.leftView = nil; //To Remove Search icon
searchTextField.textAlignment = NSTextAlignmentLeft;