查看视图层级会发现，iOS 11以下，设置titleView，x的默认坐标居然是12，而iOS 11是0。所以设置textField的x坐标的话，在iOS 11下必须多出12才会是一致的位置。
修改代码上面的代码
- (void)layoutSubviews{
[super layoutSubviews];
// search field
UITextField *searchField = [self valueForKey:@"searchField"];
searchField.backgroundColor = DARK_BLUE_COLOR;
searchField.textColor = [UIColor whiteColor];
searchField.font = [UIFont systemFontOfSize:16];
searchField.leftView = self.leftView;
if (@available(iOS 11.0, *)) {
// 查看视图层级，在iOS 11之前searchbar的x是12
searchField.frame = CGRectMake(12, 8, SCREEN_WIDTH*0.8, 28);
} else {
searchField.frame = CGRectMake(0, 8, SCREEN_WIDTH*0.8, 28);
}
searchField.borderStyle = UITextBorderStyleNone;
searchField.layer.cornerRadius = 5;
searchField.layer.masksToBounds = YES;
[searchField setValue:[UIColor whiteColor] forKeyPath:@"placeholderLabel.textColor"];
[self setValue:searchField forKey:@"searchField"];
self.searchTextPositionAdjustment = (UIOffset){10, 0}; // 光标偏移量
}
这时候就是我们想要的结果了。
首页暂时告一段落，接着开始我们的搜索页面。与首页不同的是需要searchBar与searchController配合使用。新建一个OHSearchController类 添加一个属性
@property (nonatomic, strong) OHSearchBar *ohSearchBar;
初始化代码
- (instancetype)initWithSearchResultsController:(UIViewController *)searchResultsController searchBarFrame:(CGRect)searchBarFrame placeholder:(NSString *)placeholder textFieldLeftView:(UIImageView *)leftView showCancelButton:(BOOL)showCancelButton barTintColor:(UIColor *)barTintColor{
if (self = [super initWithSearchResultsController:searchResultsController]) {
self.ohSearchBar = [[OHSearchBar alloc] initWithFrame:searchBarFrame
placeholder:placeholder
textFieldLeftView:leftView
showCancelButton:YES
tintColor:barTintColor];
UIButton *button = [self.ohSearchBar valueForKey:@"cancelButton"];
button.tintColor = [UIColor whiteColor];
[button setTitle:@"取消" forState:UIControlStateNormal];
[self.ohSearchBar setValue:button forKey:@"cancelButton"];
}
return self;
}
接着是我们的视图控制器OHSearchViewController
UIImageView *leftView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"search"]];
leftView.bounds = CGRectMake(0, 0, 24, 24);
self.ohSearchController = [[OHSearchController alloc] initWithSearchResultsController:self
searchBarFrame:CGRectMake(0, 0, SCREEN_WIDTH, 44)
placeholder:@"请输入搜索内容进行搜索"
textFieldLeftView:leftView
showCancelButton:YES
barTintColor:BASE_BLUE_COLOR];
[self.ohSearchController.ohSearchBar becomeFirstResponder];
self.ohSearchController.ohSearchBar.delegate = self;
[self.ohSearchController.ohSearchBar setLeftPlaceholder];
self.navigationItem.titleView = self.ohSearchController.ohSearchBar;
self.navigationItem.hidesBackButton = YES;
