iOS UISearchBar 封装自定义UISearchBar 含iOS11适配，可以说UISearchBar看我就够了~

鉴于UISearchBar样式修改不好操作，以及它的一些系统默认处理不符合实际产品需求，和iOS 11之后UISearchBar的placeholder居中问题跟之前版本不一样，特此封装了一个UISearchBar的子类，以后用的时候直接拿来用就方便多了。附上地址项目地址

先总结：本demo封装、修改的内容

1、 UISearchBar 样式

2、iOS11之前placeholder文字默认是居左的，iOS 11默认居中的，为了样式统一，且两个样式都支持，做了一下封装。只要继承该控件，控件内部已经实现placeholder居中和居左方案。

3、UISearchBar 的clearBtn的显示方式

4、取消按钮的title 文字内容、颜色

5、UISearchBar当失去焦点时，系统会把取消按钮的enable设为no，这样点击取消按钮的时候默认输入框会获得焦点，而不是取消搜索，实际应用中很少这样用，所以封装的控件中对改功能做了支持，既可以支持原系统默认事件，亦可以直接响应取消事件。

具体支持哪些修改，详见头文件

@interfaceFLJSearchBar :UISearchBar

/**

这里根据实际应用来做的封装，一般情况都是 UITextFieldViewModeWhileEditing和UITextFieldViewModeNever

yes-UITextFieldViewModeNever no-UITextFieldViewModeWhileEditing

默认 no

*/

@property(nonatomic,assign)BOOL clearBtnHidden;

//placeHolder 是否居中 iOS11之前默认是居中的 iOS11之后居左

@property(nonatomic,assign)BOOL placeHolderCenter;

//placeHolder文字

@property(nonatomic,copy)NSString* placeHolderString;

//placeHolder字号默认16 和输入框文字字号一样

@property(nonatomic,strong)UIFont* placeHolderStringFont;

//placeHolder文字颜色

@property(nonatomic,strong)UIColor* placeHolderStringColor;

//取消按钮文字系统默认cancel,这里默认取消

@property(nonatomic,copy)NSString* cancelBtnTitle;

//取消按钮文字颜色

@property(nonatomic,strong)UIColor* cancelBtnTitleColor;

//圆角

@property(nonatomic,assign)CGFloat cornerRadius;

//边框颜色

@property(nonatomic,strong)UIColor* borderColor;

//边框宽度

@property(nonatomic,assign)CGFloat borderWidth;

//记录默认情况下的搜索图片偏移

@property(nonatomic,assign)UIOffsetoriginPositionSearchOffSet;

//系统searchbar，如果search没有获得焦点，点击取消默认会获得焦点（而不会响应取消事件）

//cancelInputDisabled yes 直接响应取消事件

@property(nonatomic,assign)BOOL cancelInputDisabled;

.m实现

#import "FLJSearchBar.h"

#import "UIImage+Extension.h"

#define kDefaultBorderColor [UIColor colorWithRed:(225)/255.0green:(226)/255.0blue:(227)/255.0alpha:1.0]

#define kDefaultPlaceHolderTextFont [UIFont systemFontOfSize:16]

#define kDefaultPlaceHolerTextColor [UIColor colorWithRed:(187)/255.0green:(187)/255.0blue:(187)/255.0alpha:1.0]

#define kDefaultCancelBtnTitleFont [UIFont systemFontOfSize:16]

#define kDefaultCancelBtnTitleColor [UIColor colorWithRed:(102)/255.0green:(102)/255.0blue:(102)/255.0alpha:1.0]

@interface FLJSearchBar ()

@property(nonatomic,assign)BOOL hideClearBtn;

@end

@implementation FLJSearchBar

-(instancetype)initWithFrame:(CGRect)frame

{

if(self== [superinitWithFrame:frame]) {

[self setBackgroundColor:[UIColor whiteColor]];

//cancel按钮显示

self.showsCancelButton = YES;

//光标颜色tintColor

// self.tintColor = [UIColor clearColor];

self.backgroundImage = [UIImage imageWithColor:[UIColor whiteColor] size:CGSizeMake(100, self.bounds.size.height)];

[self setImage:[UIImage imageNamed:@"icon_search"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];

[self setImage:[UIImage imageNamed:@"icon_search_clear"] forSearchBarIcon:UISearchBarIconClear state:UIControlStateNormal];

//ios11 之前这个高度决定textfield高度默认28

[self setSearchFieldBackgroundImage:[UIImage imageWithColor:[UIColor clearColor] size:CGSizeMake(100, self.bounds.size.height)] forState:UIControlStateNormal];

self.originPositionSearchOffSet = UIOffsetMake(10, 0);

//搜索图标偏移

[self setPositionAdjustment:self.originPositionSearchOffSet forSearchBarIcon:UISearchBarIconSearch];

//清除按钮偏移向左偏移10

[self setPositionAdjustment:UIOffsetMake(-10, 0) forSearchBarIcon:UISearchBarIconClear];

//整个输入框（textfield）的偏移量

// [self setSearchFieldBackgroundPositionAdjustment:UIOffsetMake(10, 0)];

//文字距离搜索图标的偏移，默认是紧挨着的

[self setSearchTextPositionAdjustment:UIOffsetMake(10, 0)];

self.placeHolderString = @"请输入搜索内容";

self.cornerRadius=self.bounds.size.height/2.f;

self.borderWidth=1.f;

self.borderColor = kDefaultBorderColor;

self.placeHolderCenter = NO;

[self setCancelBtnTitle:@"取消"];

}

return self;

}

#pragma mark setter & getter

/**

设置placeHolder

@param placeHolderString placeHolder

-(void)setPlaceHolderString:(NSString*)placeHolderString

{

_placeHolderString= [placeHolderStringcopy];

UITextField*textField = [selftextField];

if(textField) {

textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:_placeHolderString attributes:@{NSForegroundColorAttributeName:_placeHolderStringColor?_placeHolderStringColor:kDefaultPlaceHolerTextColor,NSFontAttributeName:_placeHolderStringFont?_placeHolderStringFont:kDefaultPlaceHolderTextFont}];

}

}

/**

设置placeHolder字号

@param placeHolderStringFont 字号

-(void)setPlaceHolderStringFont:(UIFont*)placeHolderStringFont

{

_placeHolderStringFont= placeHolderStringFont;

UITextField*textField = [selftextField];

if(textField) {

textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:_placeHolderString attributes:@{NSForegroundColorAttributeName:_placeHolderStringColor?_placeHolderStringColor:kDefaultPlaceHolerTextColor,NSFontAttributeName:_placeHolderStringFont}];

textField.font = _placeHolderStringFont;

}

}

/**

设置placehHolder字体颜色

@param placeHolderStringColor placehHolder字体颜色

-(void)setPlaceHolderStringColor:(UIColor*)placeHolderStringColor

{

_placeHolderStringColor= placeHolderStringColor;

UITextField*textField = [selftextField];

if(textField) {

textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:_placeHolderString attributes:@{NSForegroundColorAttributeName:_placeHolderStringColor,NSFontAttributeName:_placeHolderStringFont?_placeHolderStringFont:kDefaultPlaceHolderTextFont}];

}

}

/**

设置取消按钮文字

-(void)setCancelBtnTitle:(NSString*)cancelBtnTitle

{

_cancelBtnTitle= [cancelBtnTitlecopy];

UIButton*cancel = [selfcancelBtn];

if(cancel) {

[cancelsetTitle:cancelBtnTitle forState:UIControlStateNormal];

if (!self.cancelBtnTitleColor) {

[cancelsetTitleColor:kDefaultCancelBtnTitleColor forState:UIControlStateNormal];

}

cancel.titleLabel.font = kDefaultCancelBtnTitleFont;

}

}

/**

设置取消按钮文字颜色

-(void)setCancelBtnTitleColor:(UIColor*)cancelBtnTitleColor

{

_cancelBtnTitleColor= cancelBtnTitleColor;

UIButton*cancel = [selfcancelBtn];

if(cancel) {

[cancelsetTitleColor:_cancelBtnTitleColor forState:UIControlStateNormal];

}

}

/**

隐藏清除按钮

@param clearBtnHidden yes隐藏 no输入的时候显示

-(void)setClearBtnHidden:(BOOL)clearBtnHidden

{

_clearBtnHidden= clearBtnHidden;

self.hideClearBtn = _clearBtnHidden;

}

-(void)setHideClearBtn:(BOOL)hideClearBtn

{

_hideClearBtn= hideClearBtn;

UITextField*textField = [selftextField];

if(textField) {

if (_hideClearBtn) {

textField.clearButtonMode=UITextFieldViewModeNever;

}else

textField.clearButtonMode = UITextFieldViewModeWhileEditing;

}

}

/**

设置搜索框圆角

-(void)setCornerRadius:(CGFloat)cornerRadius

{

_cornerRadius= cornerRadius;

UITextField*textField = [selftextField];

if(textField) {

textField.layer.cornerRadius=_cornerRadius;

textField.layer.masksToBounds=YES;

textField.clipsToBounds=YES;

}

}

/**

设置搜索框边框颜色

-(void)setBorderColor:(UIColor*)borderColor

{

_borderColor= borderColor;

UITextField*textField = [selftextField];

if(textField) {

textField.layer.borderColor= borderColor.CGColor;

}

}

/**

设置搜索框边框宽度

-(void)setBorderWidth:(CGFloat)borderWidth

{

_borderWidth= borderWidth;

UITextField*textField = [selftextField];

if(textField) {

textField.layer.borderWidth= borderWidth;

textField.layer.masksToBounds=YES;

}

}

/**

设置placeholder是否居中显示

- (void)setPlaceHolderCenter:(BOOL)placeHolderCenter

{

_placeHolderCenter= placeHolderCenter;

if(@available(iOS11.0, *)) {

UITextField* textField = [selftextField];

textField.delegate=self;

if (_placeHolderCenter) {

[self setPositionAdjustment:UIOffsetMake((textField.frame.size.width-[self placeHolderTextWidth])/2, 0) forSearchBarIcon:UISearchBarIconSearch];

}else

[self setPositionAdjustment:self.originPositionSearchOffSet forSearchBarIcon:UISearchBarIconSearch];

}else

{

SELcenterSelector =NSSelectorFromString([NSStringstringWithFormat:@"%@%@",@"setCenter",@"Placeholder:"]);

if([selfrespondsToSelector:centerSelector])

{

//方法1 [self setValue:@(_placeHolderCenter) forKeyPath:@"centerPlaceholder"];

//方法2

NSMethodSignature*signature = [[UISearchBarclass]instanceMethodSignatureForSelector:centerSelector];

NSInvocation*invocation = [NSInvocationinvocationWithMethodSignature:signature];

[invocationsetTarget:self];

[invocationsetSelector:centerSelector];

[invocationsetArgument:&_placeHolderCenteratIndex:2];

[invocationinvoke];

}

}

}

/**

设置当输入框没有获得焦点时，点击取消按钮是否直接响应取消事件，而不是响应输入事件

-(void)setCancelInputDisabled:(BOOL)cancelInputDisabled

{

_cancelInputDisabled= cancelInputDisabled;

UIButton*cancelBtn = [selfcancelBtn];

cancelBtn.enabled=YES;

}

#pragma mark UITextFieldDelegate

#warning 实现这两个代理方法后 searchbar的textFieldShouldBeginEditing 和textFieldShouldEndEditing将不执行需要代理调起方法

-(BOOL)textFieldShouldBeginEditing:(UITextField*)textField

{

if([self.delegaterespondsToSelector:@selector(searchBarShouldBeginEditing:)]) {

BOOL begin = [self.delegate searchBarShouldBeginEditing:self];

if(begin) {

if(@available(iOS11.0, *) &&self.placeHolderCenter) {

[self setPositionAdjustment:self.originPositionSearchOffSet forSearchBarIcon:UISearchBarIconSearch];

}

if(!self.clearBtnHidden) {

self.hideClearBtn=NO;

}

}

returnbegin;

}

if(@available(iOS11.0, *) &&self.placeHolderCenter) {

[self setPositionAdjustment:self.originPositionSearchOffSet forSearchBarIcon:UISearchBarIconSearch];

}

if (!self.clearBtnHidden) {

self.hideClearBtn=NO;

}

return YES;

}

-(BOOL)textFieldShouldEndEditing:(UITextField*)textField

{

if([self.delegaterespondsToSelector:@selector(searchBarShouldEndEditing:)]){

BOOL end = [self.delegate searchBarShouldEndEditing:self];

if(end) {

if(@available(iOS11.0, *) &&self.placeHolderCenter) {

if(textField.text.length==0) {

[self setPositionAdjustment:UIOffsetMake((textField.frame.size.width-[self placeHolderTextWidth])/2, 0) forSearchBarIcon:UISearchBarIconSearch];

}

}

if(self.clearBtnHidden) {

self.hideClearBtn=YES;

}

}

returnend;

}

if(@available(iOS11.0, *) &&self.placeHolderCenter) {

if(textField.text.length==0) {

[self setPositionAdjustment:UIOffsetMake((textField.frame.size.width-[self placeHolderTextWidth])/2, 0) forSearchBarIcon:UISearchBarIconSearch];

}

}

if (self.clearBtnHidden) {

self.hideClearBtn=YES;

}

return YES;

}

-(void)textFieldDidEndEditing:(UITextField*)textField

{

if (self.cancelInputDisabled) {

self.cancelInputDisabled = YES;

}

}

/**

获得搜索框

-(UITextField*)textField

{

UITextField*searchField = [selfvalueForKey:@"searchField"];

// for (UIView *view in self.subviews.lastObject.subviews) {

// if([view isKindOfClass:NSClassFromString(@"UISearchBarTextField")]) {

// return (UITextField*)view;

// }

// }

returnsearchField;

}

/**

获得取消按钮

-(UIButton*)cancelBtn

{

UIView* view = [selfvalueForKeyPath:@"cancelButton"];

// if ([view isKindOfClass:NSClassFromString(@"UINavigationButton")]) {

UIButton*cancelBtn = (UIButton*)view;

// }

returncancelBtn;

}

/**

计算placeHolder的宽度

-(CGFloat)placeHolderTextWidth

{

UITextField* textField = [selftextField];

return [self.placeHolderString boundingRectWithSize:textField.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSForegroundColorAttributeName:_placeHolderStringColor?_placeHolderStringColor:kDefaultPlaceHolerTextColor,NSFontAttributeName:_placeHolderStringFont?_placeHolderStringFont:kDefaultPlaceHolderTextFont} context:nil].size.width;

}

-(void)layoutSubviews

{

[super layoutSubviews];

if(@available(iOS11.0, *) &&self.placeHolderCenter) {

UITextField* textField = [selftextField];

[self setPositionAdjustment:UIOffsetMake((textField.frame.size.width-[self placeHolderTextWidth])/2, 0) forSearchBarIcon:UISearchBarIconSearch];

}

}

最后编辑于：2018.10.31 15:55:44

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iOS UISearchBar 封装 自定义UISearchBar 含iOS11适配，可以说UISearchBar看我就够了~

.m实现

#warning 实现这两个代理方法后 searchbar的textFieldShouldBeginEditing 和textFieldShouldEndEditing将不执行 需要代理调起方法

推荐阅读更多精彩内容

iOS UISearchBar 封装自定义UISearchBar 含iOS11适配，可以说UISearchBar看我就够了~

#warning 实现这两个代理方法后 searchbar的textFieldShouldBeginEditing 和textFieldShouldEndEditing将不执行需要代理调起方法