IOS基础：常用的小方法
2020-10-20 本文已影响0人
时光啊混蛋_97boy
原创：知识点总结性文章
创作不易，请珍惜，之后会持续更新，不断完善
个人比较喜欢做笔记和写总结，毕竟好记性不如烂笔头哈哈，这些文章记录了我的IOS成长历程，希望能与大家一起进步
温馨提示：由于简书不支持目录跳转，大家可通过command + F 输入目录标题后迅速寻找到你所需要的内容
目录
- 一、数字
- 获取随机数
- 二、文本
- 字体
- 点击链接跳转
- 点击背景隐藏键盘
- 三、导航栏
- 获取当前页面的控制器
- 在导航栏栈中寻找到指定的页面返回
- 设置导航栏全透明
- 禁止侧滑返回上个页面功能
- 更改导航栏的返回按钮的标题与颜色
- Demo
- 参考文献
一、数字
获取随机数
- (void)viewDidLoad
{
[super viewDidLoad];
int randomNumber = [self getRandomNumber:0 to:100];
NSLog(@"随机数：%d",randomNumber);
}
// 获取一个随机整数，范围在[from,to]，包括from，包括to
- (int)getRandomNumber:(int)from to:(int)to
{
return (int)(from + (arc4random() % (to - from + 1)));
}
输出结果为：
2020-09-25 11:00:54.338468+0800 FunctionCodeBlockDemo[5532:18165243] 随机数：65
二、文本
字体
打印系统中所有字体的类型名字
- (void)getFontNames
{
NSArray *familyNames = [UIFont familyNames];
for(NSString *familyName in familyNames )
{
printf("字体家族名称: %s \n", [familyName UTF8String]);
NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
for(NSString *fontName in fontNames)
{
printf("\t字体名称: %s \n", [fontName UTF8String]);
}
}
}
输出结果为：
字体家族名称: Academy Engraved LET
字体名称: AcademyEngravedLetPlain
字体家族名称: Al Nile
字体名称: AlNile
字体名称: AlNile-Bold
.......
点击链接跳转
- (void)ClickLinkToJump
{
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"百度"];
NSDictionary *linkDict = @{ NSLinkAttributeName:[NSURL URLWithString:@"http://www.baidu.com"] };
[str setAttributes:linkDict range:[[str string] rangeOfString:@"百度"]];
self.textView.attributedText = str;
self.textView.editable = NO;
self.textView.dataDetectorTypes = UIDataDetectorTypeLink;
}
运行效果如下：
点击链接跳转
点击背景隐藏键盘
// 点击背景隐藏键盘
- (void)tapBackgroundHideKeyboard
{
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(keyboardHide:)];
// 设置成NO表示当前控件响应后会传播到其他控件上，默认为YES
tapGestureRecognizer.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:tapGestureRecognizer];
}
- (void)keyboardHide:(UITapGestureRecognizer*)tap
{
[self.textField resignFirstResponder];
NSLog(@"点击了背景，键盘被隐藏了");
}
输出结果为：
2020-09-25 11:23:13.630446+0800 FunctionCodeBlockDemo[5946:18186936] 点击了背景，键盘被隐藏了
三、导航栏
获取当前页面的控制器
- (UIViewController *)currentViewController
{
UIViewController* currentViewController = [[[UIApplication sharedApplication] delegate] window].rootViewController;
BOOL runLoopFind = YES;
while (runLoopFind)
{
if (currentViewController.presentedViewController)
{
currentViewController = currentViewController.presentedViewController;
}
else if ([currentViewController isKindOfClass:[UINavigationController class]])
{
UINavigationController* navigationController = (UINavigationController* )currentViewController;
currentViewController = [navigationController.childViewControllers lastObject];
}
else if ([currentViewController isKindOfClass:[UITabBarController class]])
{
UITabBarController* tabBarController = (UITabBarController* )currentViewController;
currentViewController = tabBarController.selectedViewController;
}
else
{
NSUInteger childViewControllerCount = currentViewController.childViewControllers.count;
if (childViewControllerCount > 0)
{
currentViewController = currentViewController.childViewControllers.lastObject;
return currentViewController;
}
else
{
return currentViewController;
}
}
}
return currentViewController;
}
在导航栏栈中寻找到指定的页面返回
// 在导航栏栈中寻找到指定的页面返回
- (void)backToNeedViewController
{
NSMutableArray *viewControllers = [[NSMutableArray alloc] init];
for (UIViewController *viewController in [self.navigationController viewControllers])
{
[viewControllers addObject:viewController];
if ([viewController isKindOfClass:[NeedViewController class]])
{
break;
}
}
[self.navigationController setViewControllers:viewControllers animated:YES];
}
设置导航栏全透明
- (void)viewWillAppear:(BOOL)animated
{
// 设置导航栏背景图片为一个空的image，这样就透明了
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
// 去掉透明后导航栏下边的黑边
[self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];
}
- (void)viewWillDisappear:(BOOL)animated
{
// 如果不想让其他页面的导航栏变为透明 需要重置
[self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:nil];
}
禁止侧滑返回上个页面功能
- (void)disableSideslipReturn
{
// 1.首先把顶部左侧返回按钮隐藏掉
self.navigationItem.hidesBackButton = YES;
// 2.再禁止页面左侧滑动返回
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)])
{
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
如果仅仅需要禁止此单个页面返回，还需要重新开放侧滑权限。
- (void)viewWillDisappear:(BOOL)animated
{
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)])
{
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
}
更改导航栏的返回按钮的标题与颜色
- (void)changeNavigationBarTitleAndColor
{
// 返回按钮
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
// 修改返回按钮的颜色
self.navigationController.navigationBar.tintColor = [UIColor redColor];
// 设置导航条的色调
self.navigationController.navigationBar.barTintColor = [UIColor blackColor];
// 导航栏默认是半透明状态
self.navigationController.navigationBar.backgroundColor = [UIColor blueColor];
// 导航栏标题颜色
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];
self.navigationController.navigationBar.translucent = NO;
}
运行效果如下：
更改导航栏的返回按钮的标题与颜色
Demo
Demo在我的Github上，欢迎下载。
FunctionCodeBlock
