监听键盘弹出事件,添加自定义View

效果图:

项目中经常用到这种监听键盘弹出,并且自定义键盘上部的view,

6F4396FA-DA46-4A3B-96F7-B29506A4DE2F.png

一.创建一个继续自NSObject的STEAction对象

STEAction.h

#import 

@interface STEAction : NSObject
@property  (nonnull, nonatomic, copy) void (^aHandler)(STEAction  *_Nullable action);
@property (nullable,nonatomic,readonly) NSString * imageName;
@property (nullable, nonatomic, readonly) NSString *title;
@property (nonatomic, getter=isEnabled) BOOL enabled;

+ (nonnull instancetype)actionWithTitle:(nullable NSString *)title imageName:(nullable NSString *)imageName handler:(void (^ __nullable)(STEAction *_Nullable action))handler;

@end

STEAction.m

#import "STEAction.h"

@implementation STEAction

+ (nonnull instancetype)actionWithTitle:(nullable NSString *)title imageName:(nullable NSString *)imageName handler:(void (^ __nullable)(STEAction *_Nullable action))handler
{
    return [[[self class]alloc]initWithTitle:title imageName:imageName  handler:handler];
}

- (nonnull instancetype)initWithTitle:(nullable NSString *)title imageName:(nullable NSString *)imageName handler:(void (^ __nullable)(STEAction *_Nullable action))handler
{
    self = [super init];
    if (self)
    {
        self.aHandler = handler;
        _title = title;
        _imageName = imageName;
    }
    return self;
}
@end

一.监听 keyboardWillChangeFrame

STEBaseToolsBar.h

#import 


@class STEAction;
@interface STEBaseToolsBar : UIView
//头文件 暴露一些方法,方便自定义子类调用,
- (void)addObserVer;
- (void)keyboardWillChangeFrame:(NSNotification *_Nullable)note;
- (void)addAction:(nonnull STEAction*)action;
@property (nonnull, nonatomic, strong) NSMutableArray *actionArray;

@end

STEBaseToolsBar.m

#import "STEBaseToolsBar.h"
#import "STEAction.h"

@interface STEBaseToolsBar()
@property (nonatomic, assign) CGFloat keyBoradHeight;
@end

@implementation STEBaseToolsBar
#pragma mark - 键盘通知
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)awakeFromNib
{
    [super awakeFromNib];
    [self addObserVer];
}


- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        [self addObserVer];
    }
    return self;
}


#pragma mark - 键盘处理
- (void)keyboardWillChangeFrame:(NSNotification *)note {
    // 取出键盘最终的frame
    CGRect rect = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    // 取出键盘弹出需要花费的时间
    double duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    // 修改transform
    [UIView animateWithDuration:duration animations:^{
        CGFloat ty = [UIScreen mainScreen].bounds.size.height - rect.origin.y;
        self.transform = CGAffineTransformMakeTranslation(0, - ty);
    }];
}

- (void)addObserVer
{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
    // 监听键盘通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    //布局之前将之前的 按钮移除
    for (UIView *view in self.subviews) {
        if ([view isKindOfClass:[UIButton class]] && view.tag >1000 )
        {
            [view removeFromSuperview];
        }
    }
    if ([self.actionArray count] <= 0) {
        return;
    }
    
    CGFloat cWidth = CGRectGetWidth(self.bounds);
    CGFloat cHeight = CGRectGetHeight(self.bounds);
    
   __weak __typeof(self) ws = self;
    NSUInteger count = self.actionArray.count;
    CGFloat buttonWidth = cWidth/count;
    //从底部40处添加按钮
    CGFloat originY = cHeight - 40;
    
    
    //遍历事件数组
    [self.actionArray enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        if (obj && [obj isKindOfClass:[STEAction class]]) {
            
            STEAction *action = (STEAction*)obj;
            CGRect frame = CGRectMake(idx*buttonWidth, originY, buttonWidth, 40);
            UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
            button.tag = idx + 1001;
            button.frame = frame;
            [button setImage:[UIImage imageNamed:action.imageName] forState:UIControlStateNormal];
            //按钮绑定点击事件
            [button addTarget:ws action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
            [ws addSubview:button];
        }
    }];
    
}

- (void)buttonClick:(UIButton*)sender
{
    if ((sender.tag - 1001) < [self.actionArray count])
    {
        //按钮点击之后 ,自身消失,将action的aHandleBlock 传递过去.
        STEAction *action = self.actionArray[sender.tag - 1001];
        if (action.aHandler) {
            action.aHandler(action);
        }
    }
}

- (void)addAction:(STEAction *)action
{
    if (action) {
        [self.actionArray addObject:action];
    }
}

- (NSMutableArray*)actionArray
{
    if (_actionArray) {
        return _actionArray;
    }
    _actionArray = [[NSMutableArray alloc]init];
    return _actionArray;
}

@end