pushbackDemo(Modalview present)

////  RootViewController.m//  PushBackDemo////  Created by huangyibiao on 14-8-22.//  Copyright (c) 2014骞� Uni2Uni. All rights reserved.//#import "RootViewController.h"@interface RootViewController () {    UIView *_modalView;    UIView *_bgView;}@end@implementation RootViewController- (void)viewDidLoad {    [super viewDidLoad];    CGFloat y = [UIDevice currentDevice].systemVersion.integerValue >= 7 ? 64 : 0;    _bgView = [[UIView alloc] initWithFrame:self.view.bounds];    _bgView.frame = CGRectMake(0, y, self.view.bounds.size.width, self.view.bounds.size.height);    _bgView.backgroundColor = [UIColor greenColor];    [self.view addSubview:_bgView];        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];    [btn setTitle:@"鏄剧ず" forState:UIControlStateNormal];    [btn setFrame:CGRectMake(100, 50, 120, 30)];    [btn addTarget:self action:@selector(show) forControlEvents:UIControlEventTouchUpInside];    [_bgView addSubview:btn];        _modalView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height, 320, 250)];    [self.view addSubview:_modalView];    _modalView.backgroundColor = [UIColor redColor];        btn = [UIButton buttonWithType:UIButtonTypeCustom];    [btn setTitle:@"闅愯棌" forState:UIControlStateNormal];    [btn setFrame:CGRectMake(100, 50, 120, 30)];    [btn addTarget:self action:@selector(hide) forControlEvents:UIControlEventTouchUpInside];    [_modalView addSubview:btn];    return;}- (void)hide {    _bgView.userInteractionEnabled = YES;    [UIView animateWithDuration:0.3 animations:^{        _bgView.alpha = 0.35;    } completion:^(BOOL finished) {        [UIView animateWithDuration:0.3 animations:^{            _bgView.transform = CGAffineTransformMakeScale(1.0, 1.0);            self.navigationController.navigationBar.transform = CGAffineTransformMakeScale(1.0, 1.0);            _modalView.alpha = 0.0;                        _modalView.frame = CGRectMake(0, _bgView.frame.size.height,                                          _modalView.frame.size.width,                                          _modalView.frame.size.height);            _bgView.alpha = 1.0;            CGFloat y = [UIDevice currentDevice].systemVersion.integerValue >= 7 ? 64 : 0;            _bgView.frame = CGRectMake(0, y, 320, _bgView.frame.size.height);        }];    }];}- (void)show {    _bgView.userInteractionEnabled = NO;    [UIView animateWithDuration:0.3 animations:^{        _modalView.alpha = 1;        _modalView.frame = CGRectMake(0, _bgView.frame.size.height - _modalView.frame.size.height, _modalView.frame.size.width, _modalView.frame.size.height);        _bgView.alpha = 0.35;    } completion:^(BOOL finished) {        [UIView animateWithDuration:0.3 animations:^{                    _bgView.frame = CGRectMake(0, _bgView.frame.origin.y - 64 * 0.5, 320, _bgView.frame.size.height);            _bgView.transform = CGAffineTransformMakeScale(0.9, 0.9);            self.navigationController.navigationBar.transform = CGAffineTransformMakeScale(0.9, 0.6);            _bgView.alpha = 0.5;        }];    }];}@end