iOS 13 设置 UISearchBar 的 Placehol

.h 中类方法 

+ (void)setPlaceholderForTextField:(UITextField*)textFieldwithFont:(UIFont*)fontandColor:(UIColor*)textColorandPlaceholderText:(NSString*)placeholder;

.m 中实现

+ (void)setPlaceholderForTextField:(UITextField*)textFieldwithFont:(UIFont*)fontandColor:(UIColor*)textColorandPlaceholderText:(NSString*)placeholder{

    NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:placeholder attributes:@{NSForegroundColorAttributeName:textColor,NSFontAttributeName:font}];

    textField.attributedPlaceholder= attrString;

}

使用方法

*UISearchBar中有searchTextField 属性

  [MyUtil setPlaceholderForTextField:_searchBar.searchTextField withFont:[UIFont systemFontOfSize:13] andColor:[UIColor greenColor] andPlaceholderText:@"提示内容"];