UIStepper 缩放：UI的使用

// 实现文件：声明在对应的.h文件。继承至UIViewControllor

- (void)viewDidLoad

{

[super viewDidLoad];

// 按钮

self.stp = [[UIStepper alloc] initWithFrame:CGRectMake(20, 30, 150, 30)];

self.stp.tintColor = [UIColor whiteColor];

self.stp.value = 5;

self.stp.maximumValue = 5;

[self.view addSubview:self.stp];

// 默认背景

self.view.backgroundColor = [[UIColor alloc]initWithPatternImage:

[UIImage imageNamed:@"beijing1.jpg"]];

// 创建视图

self.imv = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

// 自动缩放

self.imv.autoresizingMask = UIViewAutoresizingFlexibleWidth |

UIViewAutoresizingFlexibleHeight;

[self.view addSubview:self.imv];

// 事件

[self.stp addTarget:self action:@selector(changeState) forControlEvents:UIControlEventValueChanged];

}

- (void)changeState

{

// 每次都重置，保证是从6plus的基础上改变

self.imv.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

// default is iPhone6plus: 414 735

switch ((int)self.stp.value)

{

case Phone:// 240 320

self.imv.frame = CGRectInset(self.imv.frame, 174, 215);

self.imv.image = [UIImage imageNamed:@"Phone.jpg"];

break;

case iPhone4:// 240 320

self.imv.frame = CGRectInset(self.imv.frame, 174, 216);

self.imv.image = [UIImage imageNamed:@"iPhone5.jpg"];

break;

case iPhone5:// 320 568

self.imv.frame = CGRectInset(self.imv.frame, 94, 168);

self.imv.image = [UIImage imageNamed:@"iPhone5.jpg"];

break;

case iPhone6:// 375 667

self.imv.frame = CGRectInset(self.imv.frame, 39, 69);

self.imv.image = [UIImage imageNamed:@"iPhone6.jpg"];

break;

case iPhone6plus:// 414 736

self.imv.frame = CGRectInset(self.imv.frame, 0, 0);

self.imv.image = [UIImage imageNamed:@"iPhone6plus.jpg"];

break;

default:

self.view.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"beijing.jpg"]];

break;

}

NSLog(@"%f", self.stp.value);

}