070选择一个分段卡后可以改变屏幕的背景颜色

效果如下：

ViewController.h

 

1 #import <UIKit/UIKit.h>

2 

3 @interface ViewController : UIViewController

4 @property (strong, nonatomic) NSArray *arrColorName;

5 

6 @end

ViewController.m

 1 #import "ViewController.h"

 2 

 3 @interface ViewController ()

 4 - (void)layoutUI;

 5 - (void)segmentDidChange:(UISegmentedControl *)sender;

 6 @end

 7 

 8 @implementation ViewController

 9 

10 - (void)viewDidLoad {

11     [super viewDidLoad];

12     

13     [self layoutUI];

14 }

15 

16 - (void)didReceiveMemoryWarning {

17     [super didReceiveMemoryWarning];

18     // Dispose of any resources that can be recreated.

19 }

20 

21 - (void)layoutUI {

22     _arrColorName = @[@"blackColor", @"blueColor", @"brownColor"];

23     UIColor *color = [UIColor colorWithRed:1.000 green:0.473 blue:0.813 alpha:1.000];

24     self.view.backgroundColor = color;

25     

26     UISegmentedControl *smtBackgroundColor = [[UISegmentedControl alloc] initWithItems:_arrColorName];

27     smtBackgroundColor.frame = CGRectMake(0, 0, 240, 40);

28     smtBackgroundColor.tintColor = color;

29     [smtBackgroundColor addTarget:self

30                            action:@selector(segmentDidChange:)

31                  forControlEvents:UIControlEventValueChanged];

32     

33     //将分段卡追加到导航条的右侧

34     UIBarButtonItem *barBtnRight = [[UIBarButtonItem alloc] initWithCustomView:smtBackgroundColor];

35     self.navigationItem.rightBarButtonItem = barBtnRight;

36 }

37 

38 - (void)segmentDidChange:(UISegmentedControl *)sender {

39     NSString *colorName = _arrColorName[sender.selectedSegmentIndex];

40     SEL selColor = NSSelectorFromString(colorName);

41     UIColor *color = [UIColor performSelector:selColor];

42     self.view.backgroundColor = color;

43     sender.tintColor = color;

44 }

45 

46 @end

AppDelegate.h

1 #import <UIKit/UIKit.h>

2 

3 @interface AppDelegate : UIResponder <UIApplicationDelegate>

4 @property (strong, nonatomic) UIWindow *window;

5 @property (strong, nonatomic) UINavigationController *navigationController;

6 

7 @end

AppDelegate.m

 1 #import "AppDelegate.h"

 2 #import "ViewController.h"

 3 

 4 @interface AppDelegate ()

 5 @end

 6 

 7 @implementation AppDelegate

 8 

 9 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

10     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

11     ViewController *viewController = [[ViewController alloc] init];

12     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

13     _window.rootViewController = _navigationController;

14     [_window addSubview:_navigationController.view];

15     [_window makeKeyAndVisible];

16     return YES;

17 }

18 

19 - (void)applicationWillResignActive:(UIApplication *)application {

20 }

21 

22 - (void)applicationDidEnterBackground:(UIApplication *)application {

23 }

24 

25 - (void)applicationWillEnterForeground:(UIApplication *)application {

26 }

27 

28 - (void)applicationDidBecomeActive:(UIApplication *)application {

29 }

30 

31 - (void)applicationWillTerminate:(UIApplication *)application {

32 }

33 

34 @end