iOS TPKeyboardAvoiding自动识别键盘的高度

                

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];

    UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]];
    self.window.rootViewController = navi;

    [self.window makeKeyAndVisible];
    return YES;
}

@end

#import <UIKit/UIKit.h>
#import "TPKeyboardAvoidingScrollView.h"

@interface RootViewController : UIViewController

@property(nonatomic, assign) NSInteger id;
//@property(nonatomic, copy) NSString *name;//姓名
//@property(nonatomic, copy) NSString *bankAccount;//银行账号
//@property(nonatomic, copy) NSString *bankName;// 开户的银行
@property(nonatomic, strong) TPKeyboardAvoidingScrollView *backgroundView;//背景图

@end

#import "RootViewController.h"

#define WIDTH [UIScreen mainScreen].bounds.size.width
#define TAG 10000
#define topHeight 20

@interface RootViewController ()
{
    UIImageView *lineView;
}
@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //适配ios7
    if([UIDevice currentDevice].systemVersion.floatValue >= 7.0) {
        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.extendedLayoutIncludesOpaqueBars = NO;
        self.modalPresentationCapturesStatusBarAppearance = NO;
    }
    self.title = @"绑定银行卡";

    _backgroundView = [[TPKeyboardAvoidingScrollView alloc] initWithFrame:CGRectMake(, , WIDTH, [UIScreen mainScreen].bounds.size.height - )];
//    _backgroundView.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:_backgroundView];

    //初始化label
    [self setupLable:CGRectMake(, topHeight, , ) title:@"开户银行:"];
    [self setupLable:CGRectMake(, topHeight+, , ) title:@"开户归属地:"];
    [self setupLable:CGRectMake(, topHeight+, , ) title:@"姓   名:"];
    [self setupLable:CGRectMake(, topHeight+, , ) title:@"账   号:"];
    [self setupLable:CGRectMake(, topHeight+, , ) title:@"验证码:"];
    //初始化银行类型textField
    [self setupTextField:CGRectMake(, topHeight, (WIDTH - )-, ) placeholder:@"请输入银行类型" index:];
    //初始化省份textField
    UITextField *provinceTF = [self setupTextField:CGRectMake(, topHeight+,(WIDTH -  - (+) - )/2.0, ) placeholder:@"请输入省份" index:];
    //小细线
    lineView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetMaxX(provinceTF.frame)+, CGRectGetMidY(provinceTF.frame), , )];
    lineView.backgroundColor = [UIColor lightGrayColor];
    [self.backgroundView addSubview:lineView];
    //初始化地级市textField
    [self setupTextField:CGRectMake(CGRectGetMaxX(lineView.frame)+, topHeight+, (WIDTH -  - (+) - )/2.0, ) placeholder:@"请输入地级市" index:];
    //初始化姓名textField
    [self setupTextField:CGRectMake(, topHeight+, (WIDTH - )-, ) placeholder:@"请输入姓名" index:];
    //初始化银行账号textField
    [self setupTextField:CGRectMake(, topHeight+, (WIDTH - )-, ) placeholder:@"请输入银行账号" index:];
    //初始化验证码textField(100是获取验证码按钮的宽度)
    UITextField *securityCodeTF = [self setupTextField:CGRectMake(, topHeight+, (WIDTH - )- -  - , ) placeholder:@"验证码" index:];
    //初始化确定按钮
    [self setupButton:CGRectMake((WIDTH - )/2.0,CGRectGetMaxY(securityCodeTF.frame)+ /*_backgroundView.frame.size.height - 30*/, , ) title:@"确定" image:@"确定按钮.png" selector:@selector(makeSureAction:)];

    //初始化获取验证码按钮
    [self setupButton:CGRectMake(CGRectGetMaxX(securityCodeTF.frame)+ , topHeight+, , ) title:@"获取验证码" image:@"矩形-2.png" selector:@selector(getSecurityCode:)];

}
/**
 *  获取验证码
 */
- (void)getSecurityCode:(UIButton *)sender{
    NSLog(@"获取验证码操作");
}

// 点击确定按钮，提交数据
- (void)makeSureAction:(UIButton *)sender{
    NSLog(@"提交前需要判断");
}
/**
 *  初始化button
 */
- (void)setupButton:(CGRect)frame title:(NSString *)title image:(NSString *)imageName selector:(SEL)selectorName{
    UIButton *securityCode = [UIButton buttonWithType:UIButtonTypeCustom];
    securityCode.frame = frame;
    securityCode.layer.cornerRadius = 5.2;
    [securityCode setTitle:title forState:];
    securityCode.clipsToBounds = YES;
    securityCode.titleLabel.font = [UIFont systemFontOfSize:];
    [securityCode setBackgroundImage:[UIImage imageNamed:imageName] forState:];
    [securityCode addTarget:self action:selectorName forControlEvents:UIControlEventTouchUpInside];
    [self.backgroundView addSubview:securityCode];
}
/**
 *  初始化UITextField
 */
- (UITextField *)setupTextField:(CGRect)frame placeholder:(NSString *)context index:(NSInteger)tag{
    UITextField *tf = [[UITextField alloc] initWithFrame:frame];
    tf.font = [UIFont systemFontOfSize:];
    tf.placeholder = context;
    tf.tag = TAG + tag;
    tf.borderStyle = UITextBorderStyleRoundedRect;
    [self.backgroundView addSubview:tf];
    return tf;
}
/**
 *  初始化UILabel
 */
- (void)setupLable:(CGRect)frame title:(NSString*)content{
    UILabel *label = [[UILabel alloc] initWithFrame:frame];
    label.text = content;
    label.font = [UIFont systemFontOfSize:];
    label.textAlignment = NSTextAlignmentRight;
    [self.backgroundView addSubview:label];
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)even{
    [self.view endEditing:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];

}

@end

/**
 *  第三方框架（TPKeyboardAvoiding）的代码
 */
#import <UIKit/UIKit.h>

@interface TPKeyboardAvoidingScrollView : UIScrollView{

    UIEdgeInsets    _priorInset;
    BOOL            _priorInsetSaved;
    BOOL            _keyboardVisible;
    CGRect          _keyboardRect;
    CGSize          _originalContentSize;
}

- (void)adjustOffsetToIdealIfNeeded;

@end

/**
 *  第三方框架（TPKeyboardAvoiding）的代码
 */
#import "TPKeyboardAvoidingScrollView.h"

#define _UIKeyboardFrameEndUserInfoKey (&UIKeyboardFrameEndUserInfoKey != NULL ? UIKeyboardFrameEndUserInfoKey : @"UIKeyboardBoundsUserInfoKey")

#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height

@interface TPKeyboardAvoidingScrollView ()
- (UIView*)findFirstResponderBeneathView:(UIView*)view;
- (UIEdgeInsets)contentInsetForKeyboard;
- (CGFloat)idealOffsetForView:(UIView *)view withSpace:(CGFloat)space;
- (CGRect)keyboardRect;
@end

@implementation TPKeyboardAvoidingScrollView

- (void)setup {
    _priorInsetSaved = NO;
    if ( CGSizeEqualToSize(self.contentSize, CGSizeZero) ) {
        self.contentSize = self.bounds.size;
    }
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

-(id)initWithFrame:(CGRect)frame {
    if ( !(self = [super initWithFrame:frame]) ) return nil;
    [self setup];
    return self;

}

-(void)awakeFromNib {
    [self setup];
}

-(void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [super dealloc];
}

-(void)setFrame:(CGRect)frame {
    [super setFrame:frame];

    CGSize contentSize = _originalContentSize;
    contentSize.width = MAX(contentSize.width, SCREEN_WIDTH);
    contentSize.height = MAX(contentSize.height, SCREEN_HEIGHT-);
    [super setContentSize:contentSize];

    if ( _keyboardVisible ) {
        self.contentInset = [self contentInsetForKeyboard];
    }
}

-(void)setContentSize:(CGSize)contentSize {
    _originalContentSize = contentSize;

    contentSize.width = MAX(contentSize.width, contentSize.width);
    contentSize.height = MAX(contentSize.height, contentSize.height);
    [super setContentSize:contentSize];

    if ( _keyboardVisible ) {
        self.contentInset = [self contentInsetForKeyboard];
    }
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [[self findFirstResponderBeneathView:self] resignFirstResponder];
    [super touchesEnded:touches withEvent:event];
}

- (void)keyboardWillShow:(NSNotification*)notification {
    _keyboardRect = [[[notification userInfo] objectForKey:_UIKeyboardFrameEndUserInfoKey] CGRectValue];
    _keyboardVisible = YES;

    UIView *firstResponder = [self findFirstResponderBeneathView:self];
    if ( !firstResponder ) {
        // No child view is the first responder - nothing to do here
        return;
    }

    if (!_priorInsetSaved) {
        _priorInset = self.contentInset;
        _priorInsetSaved = YES;
    }

    // Shrink view's inset by the keyboard's height, and scroll to show the text field/view being edited
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
    [UIView setAnimationDuration:[[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]];

    self.contentInset = [self contentInsetForKeyboard];
    [self setContentOffset:CGPointMake(self.contentOffset.x,
                                       [self idealOffsetForView:firstResponder withSpace:[self keyboardRect].origin.y - self.bounds.origin.y])
                  animated:YES];

    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification*)notification {
    _keyboardRect = CGRectZero;
    _keyboardVisible = NO;

    // Restore dimensions to prior size
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
    [UIView setAnimationDuration:[[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]];
    self.contentInset = _priorInset;
    _priorInsetSaved = NO;
    [UIView commitAnimations];
}

- (UIView*)findFirstResponderBeneathView:(UIView*)view {
    // Search recursively for first responder
    for ( UIView *childView in view.subviews ) {
        if ( [childView respondsToSelector:@selector(isFirstResponder)] && [childView isFirstResponder] ) return childView;
        UIView *result = [self findFirstResponderBeneathView:childView];
        if ( result ) return result;
    }
    return nil;
}

- (UIEdgeInsets)contentInsetForKeyboard {
    UIEdgeInsets newInset = self.contentInset;
    CGRect keyboardRect = [self keyboardRect];
    newInset.bottom = keyboardRect.size.height - ((keyboardRect.origin.y+keyboardRect.size.height) - (self.bounds.origin.y+self.bounds.size.height));
    return newInset;
}

-(CGFloat)idealOffsetForView:(UIView *)view withSpace:(CGFloat)space {

    // Convert the rect to get the view's distance from the top of the scrollView.
    CGRect rect = [view convertRect:view.bounds toView:self];

    // Set starting offset to that point
    CGFloat offset = rect.origin.y;

    if ( self.contentSize.height - offset < space ) {
        // Scroll to the bottom
        offset = self.contentSize.height - space;
    } else {
        if ( view.bounds.size.height < space ) {
            // Center vertically if there's room
            offset -= floor((space-view.bounds.size.height)/2.0);
        }
        if ( offset + space > self.contentSize.height ) {
            // Clamp to content size
            offset = self.contentSize.height - space;
        }
    }

    if (offset < ) offset = ;

    return offset;
}

-(void)adjustOffsetToIdealIfNeeded {

    // Only do this if the keyboard is already visible
    if ( !_keyboardVisible ) return;

    CGFloat visibleSpace = self.bounds.size.height - self.contentInset.top - self.contentInset.bottom;

    CGPoint idealOffset = CGPointMake(, [self idealOffsetForView:[self findFirstResponderBeneathView:self] withSpace:visibleSpace]);

    [self setContentOffset:idealOffset animated:YES];
}

- (CGRect)keyboardRect {
    CGRect keyboardRect = [self convertRect:_keyboardRect fromView:nil];
    if ( keyboardRect.origin.y ==  ) {
        CGRect screenBounds = [self convertRect:[UIScreen mainScreen].bounds fromView:nil];
        keyboardRect.origin = CGPointMake(, screenBounds.size.height - keyboardRect.size.height);
    }
    return keyboardRect;
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end