输入框被键盘遮挡（CDPMonitorKeyboard）

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface CDPMonitorKeyboard : NSObject

//获取其单例
+(CDPMonitorKeyboard *)defaultMonitorKeyboard;

//键盘出现时调用方法
-(void)keyboardWillShowWithSuperView:(UIView *)superView andNotification:(NSNotification *)notification higherThanKeyboard:(NSInteger)valueOfTheHigher;

//键盘消失时调用方法
-(void)keyboardWillHide;


@end

#import "CDPMonitorKeyboard.h"

@implementation CDPMonitorKeyboard{
    UIView *_superView;//输入view的父view
    CGRect _superViewOldFrame;
}

//单例化
+(CDPMonitorKeyboard *)defaultMonitorKeyboard{
    static CDPMonitorKeyboard *monitorKeyboard= nil;
    
    @synchronized(self){
        if (!monitorKeyboard) {
            monitorKeyboard=[[self alloc] init];
        }
    }
    return monitorKeyboard;
}


//当键盘出现时调用方法
-(void)keyboardWillShowWithSuperView:(UIView *)superView andNotification:(NSNotification *)notification higherThanKeyboard:(NSInteger)valueOfTheHigher{
    _superView=superView;
    _superViewOldFrame=superView.frame;
    //获取键盘的高度
    NSDictionary *userInfo = [notification userInfo];
    NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [aValue CGRectValue];
    NSInteger height = keyboardRect.size.height;
    
    for (UIView *view in superView.subviews) {
        if (view.isFirstResponder==YES) {
            NSInteger value=superView.bounds.size.height-view.frame.origin.y-view.bounds.size.height;
            if (value<height) {
                [UIView animateWithDuration:0.3 animations:^{
                    //防止超出视图最大范围
                    if (value-height-valueOfTheHigher+height<=0) {
                        superView.frame=CGRectMake(0,-height,superView.bounds.size.width,superView.bounds.size.height);
                    }
                    else{
                        superView.frame=CGRectMake(0,value-height-valueOfTheHigher,superView.bounds.size.width,superView.bounds.size.height);
                    }
                }];
            }
        }
    }
    //tableView判断
    if (superView.class==[UITableView class]) {
        UITableView *tableView=(UITableView *)superView;
        for (UITableViewCell *cell in [[superView.subviews objectAtIndex:0] subviews]) {
            for (UIView *view in [[cell.subviews objectAtIndex:0] subviews]) {
                if (view.isFirstResponder==YES) {
                    UIView *cellView=view.superview.superview;
                    float value1=cellView.frame.origin.y+cellView.bounds.size.height-tableView.contentOffset.y;
                    float value2=tableView.bounds.size.height-value1;
                    float value=value2+(superView.superview.bounds.size.height-superView.bounds.size.height-superView.frame.origin.y);
                    
                    if (value<height) {
                        [UIView animateWithDuration:0.3 animations:^{
                            //防止超出视图最大范围
                            if (value-height-valueOfTheHigher+height<=0) {
                                superView.frame=CGRectMake(0,_superViewOldFrame.origin.y-height,superView.bounds.size.width,superView.bounds.size.height);
                            }
                            else{
                                superView.frame=CGRectMake(0,_superViewOldFrame.origin.y+(value-height-valueOfTheHigher),superView.bounds.size.width,superView.bounds.size.height);
                            }
                        }];
                    }

                }
            }
            
        }
    }
    
}

//当键退出时调用
-(void)keyboardWillHide{
    [UIView animateWithDuration:0.3 animations:^{
        if (_superView) {
            //_superView.frame=_superViewOldFrame;
　　　　　　　//注意，这里修改了源代码，避免输入中文出现bug
　　　　　　_superView.frame=[UIScreen mainScreen].bounds;
        }
    }];
    
    _superView=nil;
}
@end

    //增加监听，当键盘出现或改变时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    //增加监听，当键退出时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

#pragma mark 键盘监听方法设置
//当键盘出现时调用
-(void)keyboardWillShow:(NSNotification *)aNotification{
    //第一个参数写输入view的父view即可，第二个写监听获得的notification，第三个写希望高于键盘的高度(只在被键盘遮挡时才启用,如控件未被遮挡,则无变化)
    //如果想不通输入view获得不同高度，可自己在此方法里分别判断区别
    [[CDPMonitorKeyboard defaultMonitorKeyboard] keyboardWillShowWithSuperView:self.view andNotification:aNotification higherThanKeyboard:0];
    
}
//当键退出时调用
-(void)keyboardWillHide:(NSNotification *)aNotification{
    [[CDPMonitorKeyboard defaultMonitorKeyboard] keyboardWillHide];
}

//dealloc中需要移除监听
-(void)dealloc{
    //移除监听，当键盘出现或改变时收出消息
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    
    //移除监听，当键退出时收出消息
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}