- 效果图
02.gif
#import "ViewController.h"
#define kScreenW [UIScreen mainScreen].bounds.size.width
#define kScreenH [UIScreen mainScreen].bounds.size.height
#define kScreenB [UIScreen mainScreen].bounds
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *txtInput;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
/** 添加通知 */
NSNotificationCenter * center = [NSNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(moveKeyboard:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
-(void)moveKeyboard:(NSNotification *)notification{
/** 键盘完全弹出时间 */
NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] intValue];
/** 动画趋势 */
int curve = [notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] intValue];
/** 动画执行完毕frame */
CGRect keyboard_frame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
/** 获取键盘y值 */
CGFloat keyboard_y = keyboard_frame.origin.y;
/** view上平移的值 */
CGFloat offset = kScreenH - keyboard_y;
/** 执行动画 */
[UIView animateWithDuration:duration animations:^{
[UIView setAnimationCurve:curve];
self.view.transform = CGAffineTransformMakeTranslation(0, -offset);
}];
}
//移除通知
-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
知识点:通过通知监听键盘弹出,获取键盘弹出后的frame,以及完全弹出执行动画的时间--duration,以及动画的趋势curve.最后算出要平移的距离offset即可.
