移动开发iOS之如何在UI界面实现视图的交替

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首先，在IOS中建立一个Single View Application；
在创建一个类Cocoa Touch Class，继承于ViewController类；
在ViewController写：

#import “ViewController.h”
#import “NextViewController.h”
@interface ViewController ()
@end

@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];

//模态视图推送

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
button.translatesAutoresizingMaskIntoConstraints = NO;
[button setTitle:@”推送” forState:0];
[button addTarget:self action:@selector(pushAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
//给按钮添加约束来布局，即相当于frame的功能：
NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
[self.view addConstraint:constraint];

constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];[self.view addConstraint:constraint];constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:60];[self.view addConstraint:constraint];constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:30];[self.view addConstraint:constraint];

-(void)pushAction:(UIButton *)sender{

NextViewController *nextViewController = [[NextViewController alloc] init];

//模态视图过度动画
nextViewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;

[self presentViewController:nextViewController animated:YES completion:^{

}];

}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];

}

@end

在新建的类中这么写：
#import “ViewController.h”
@interface NextViewController : ViewController
@end

#import “NextViewController.h”
@interface NextViewController ()
@end
@implementation NextViewController
- (void)viewDidLoad {
self.view.backgroundColor = [UIColor redColor];

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];button.translatesAutoresizingMaskIntoConstraints = NO;[button setTitle:@"返回" forState:0];[button addTarget:self action:@selector(popAction:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:button];NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];[self.view addConstraint:constraint];constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];[self.view addConstraint:constraint];constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:60];[self.view addConstraint:constraint];constraint = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:30];[self.view addConstraint:constraint]；

}

-(void)popAction:(UIButton *)sender{
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end

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