在 iOS7 中，搜索图标和占位符文本总是出现在中间。我尝试将搜索栏中文本字段的文本对齐方式更改为左对齐，但没有成功。有什么方法可以让搜索栏搜索图标在 iOS7 中显示为左对齐
我尝试了以下几行，但没有奏效：
UITextField *txfSearchField = [_searchBar valueForKey:@"_searchField"];
txfSearchField.textAlignment = NSTextAlignmentLeft;
[_searchArticle setImage:image forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
UIimageView *im = [UIImageView alloc]init];
im.image = image;
txfSearchField.leftView =im;
无法更改搜索栏占位符文本的对齐方式，我尝试了很多“SO”答案，但没有人在工作。最后我以这个解决方法结束
在占位符文本的右侧留一些空白
if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
// Load resources for iOS 6.1 or earlier
self.searchBar.placeholder = @"hello";
} else {
// Load resources for iOS 7 or later
self.searchBar.placeholder = @"hello ";
}
享受 ！！
在 Swift-3 中：-
放大图标可以通过在 searchBar 上添加子视图并取消默认放大图标来左对齐。
let width = 20
let height = 20
func changeSearchBarIcon() {
let topView: UIView = searchBar.subviews[0] as UIView
var searchField:UITextField!
for subView in topView.subviews {
if subView is UITextField {
searchField = subView as! UITextField
break
}
}
if ((searchField) != nil) {
let leftview = searchField.leftView as! UIImageView
let magnifyimage = leftview.image
let imageView = UIImageView(frame: CGRect(x: searchBar.frame.origin.x , y: 10, width: width, height: height ) )
imageView.image = magnifyimage
searchField.leftView = UIView(frame: CGRect(x: 0 , y: 0, width: width, height: height) )
searchField.leftViewMode = .always
searchField.superview?.addSubview(imageView)
}
}
这不是一个好的解决方案，但它有效。（在 iOS 9 上测试）
import UIKit
class MySearchBar: UISearchBar {
override func layoutSubviews() {
super.layoutSubviews()
if let l = getTextFieldLabel() {
l.addObserver(self, forKeyPath: "frame", options: .New, context: nil)
}
if let i = getIcon() {
i.addObserver(self, forKeyPath: "frame", options: .New, context: nil)
}
}
override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
if let l = object as? UILabel {
l.removeObserver(self, forKeyPath: "frame")
l.frame = CGRect(x: 29, y: 1, width: 323, height: 25)
l.addObserver(self, forKeyPath: "frame", options: .New, context: nil)
}
if let i = object as? UIImageView {
i.removeObserver(self, forKeyPath: "frame")
i.frame = CGRect(x: 8, y: 7.5, width: 13, height: 13)
i.addObserver(self, forKeyPath: "frame", options: .New, context: nil)
}
}
func getTextFieldLabel() -> UILabel? {
for v in self.allSubViews(self) {
if NSStringFromClass(v.dynamicType) == "UISearchBarTextFieldLabel" {
return v as? UILabel
}
}
return nil
}
func getIcon() -> UIImageView? {
for v in self.allSubViews(self) {
if NSStringFromClass(v.dynamicType) == "UIImageView" {
return v as? UIImageView
}
}
return nil
}
func allSubViews( v : UIView!) -> [UIView] {
var views : [UIView] = []
views += v.subviews
for s in v.subviews {
views += allSubViews(s)
}
return views
}
}
[self setBackgroundColor:[UIColor clearColor]];
[self setTextAlignment:NSTextAlignmentLeft];
[self setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
[self setAutocorrectionType:UITextAutocorrectionTypeNo];
[self setAutocapitalizationType:UITextAutocapitalizationTypeNone];
[self setPlaceholder:@"Search"];
[self setLeftView:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"search-icon"]]];
[self setLeftViewMode:UITextFieldViewModeAlways];
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString* searchString = [textField.text stringByReplacingCharactersInRange:range withString:string];
searchYourFriendsArray = [[NSMutableArray alloc] init];
if(searchString.length > 0 )
{
NSMutableArray *searchArray = [NSMutableArray arrayWithArray:yourFriendsArray];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"FirstName beginswith[C] %@ OR LastName beginswith[C] %@",searchString,searchString];
searchYourFriendsArray = [NSMutableArray arrayWithArray:[searchArray filteredArrayUsingPredicate:predicate]];
}
return YES;
}
你可以调用这个方法，它看起来像截图：
+(void)customizeDisplayForSeachbar:(UISearchBar *)searchBar
{
searchBar.barTintColor = [UIColor whiteColor];
searchBar.layer.borderWidth = 0.0;
searchBar.layer.borderColor = [UIColor clearColor].CGColor;
UITextField *txfSearchField = [searchBar valueForKey:@"_searchField"];
UIImage *imageIcon=[UIImage imageNamed:@"search_icon.png"];
float iconWidth=14;
UIImageView *imgView=[[UIImageView alloc] initWithFrame:CGRectMake(15, (txfSearchField.superview.frame.size.height-iconWidth)/2-1, iconWidth, iconWidth)];
imgView.contentMode=UIViewContentModeScaleAspectFit;
imgView.image=imageIcon;
txfSearchField.leftView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 40)];
txfSearchField.leftViewMode=UITextFieldViewModeAlways;
[txfSearchField.superview addSubview:imgView];
}
iOS 9 的解决方法：
extension ViewController: UISearchBarDelegate {
func searchBarShouldBeginEditing(searchBar: UISearchBar) -> Bool {
if let searchTextField = searchBar.valueForKey("_searchField") as? UITextField {
if let placeholderLabel = searchTextField.valueForKey("_placeholderLabel") as? UILabel {
if searchTextField.textColor == placeholderLabel.textColor {
searchTextField.text = ""
searchTextField.textColor = UIColor.blackColor()
searchTextField.clearButtonMode = .Always
}
}
}
return true
}
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
if searchBar.text == "" {
if let searchTextField = searchBar.valueForKey("_searchField") as? UITextField {
if let placeholderLabel = searchTextField.valueForKey("_placeholderLabel") as? UILabel {
searchBar.text = "Placeholder"
searchTextField.textColor = placeholderLabel.textColor
searchTextField.clearButtonMode = .Never
}
}
}
searchBar.resignFirstResponder()
}
}