设置 UISearchBar 输入字体颜色 和 默认字体颜色

UISearchBar *searchBar = [[UISearchBar
alloc] initWithFrame:CGRectMake(0,
0, 210,
44)];

// Get the instance of the UITextField of the search bar

UITextField *searchField = [searchBar valueForKey:@"_searchField"];

// Change search bar text color
searchField.textColor = [UIColor
blackColor];

// Change the search bar placeholder text color
[searchField
setValue:[UIColor
blackColor]
forKeyPath:@"_placeholderLabel.textColor"];