iOS开发中遇到的小问题-----总结

Posted 2023-02-16

参考技术A 1、统一收键盘的方法

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

2、提示框

BBAlertView *alert = [[BBAlertView alloc] initWithStyle:BBAlertViewStyleDefault

Title:@"删除订单"

message:@"是否删除订单,"

customView:nil

delegate:self

cancelButtonTitle:L(@"取消")

otherButtonTitles:L(@"确认")];

[alert setCancelBlock:^

];

[alert setConfirmBlock:^

[self orderDidRemovePressDown:tempDic Index:index.section];

];

[alert show];

3、图片的自适应功能

self.brandImage.contentMode = UIViewContentModeScaleAspectFit;

4、cocoaPods清除缓存问题

$ sudo rm -fr ~/.cocoapods/repos/master

$ pod setup

5、设置显示键盘的样式

textView.keyboardType =UIKeyboardTypeDefault;

//设置键盘右下角为完成（中文输入法下）

textView.returnKeyType=UIReturnKeyDone;

6、输出当前时间

NSDateFormatter * dateFormatter=[[NSDateFormatter alloc]init];

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];

NSLog(@"当前毫秒时间1==%@",[dateFormatter stringFromDate:[NSDate date]]);

7、显示两秒然后消失

UILabel * lab=[[UILabel alloc]initWithFrame:CGRectMake(60,Main_Screen_Height-64-49-60, Main_Screen_Width-120, 50)];

lab.backgroundColor=[UIColor grayColor];

ViewRadius(lab, 20);

lab.textAlignment=NSTextAlignmentCenter;

lab.text=@"请先进行实名制验证";

[self.view addSubview:lab];

[UILabel animateWithDuration:2 animations:^

lab.alpha=0;

completion:^(BOOL finished)

[lab removeFromSuperview];

];

8、设置placeholder属性的大小和颜色

[_phoneFie setValue:[UIColor grayColor] forKeyPath:@"_placeholderLabel.textColor"];

[_phoneFie setValue:[UIFont boldSystemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];

_phoneFie.returnKeyType=UIReturnKeyDone;

9、设置cell的交互完全不可以使用

//[cellTwo setUserInteractionEnabled:NO];

//设置cell不可以点击，但是上面的子控件可以交互

cellTwo.selectionStyle=UITableViewCellSelectionStyleNone;

10、将textField的placeholder 属性的字体向右边移动5

_field.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10*Width_375, _field.frame.size.height)];

_field.leftViewMode = UITextFieldViewModeAlways;

11、开新线程使按钮上的时间变化

-(void)startTime

__block int timeout=60; //倒计时时间

UIButton * btn=(UIButton *)[self.view viewWithTag:1000];

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);

dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行

dispatch_source_set_event_handler(_timer, ^

if(timeout<=0)

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^

[btn setTitle:@"发送验证码" forState:UIControlStateNormal];

btn.enabled = YES;

);

else

//  int minutes = timeout / 60;

int miao = timeout % 60;

if (miao==0)

miao = 60;



NSString *strTime = [NSString stringWithFormat:@"%.2d", miao];

dispatch_async(dispatch_get_main_queue(), ^

[btn setTitle:[NSString stringWithFormat:@"剩余%@秒",strTime] forState:UIControlStateNormal];

btn.enabled = NO;

);

timeout--;



);

dispatch_resume(_timer);



12、隐藏TableView 中多余的行

UIView * view=[[UIView alloc]initWithFrame:CGRectZero];

[_tabelView setTableFooterView:view];

13、UIView添加背景图片

UIImage * image=[UIImage imageNamed:@"friend750"];

headSeV.layer.contents=(id)image.CGImage;

14、UITableView取消选中状态

[tableView deselectRowAtIndexPath:indexPath animated:YES];// 取消选中

15、带属性的字符串

NSFontAttributeName  字体

NSParagraphStyleAttributeName  段落格式

NSForegroundColorAttributeName  字体颜色

NSBackgroundColorAttributeName  背景颜色

NSStrikethroughStyleAttributeName 删除线格式

NSUnderlineStyleAttributeName      下划线格式

NSStrokeColorAttributeName        删除线颜色

NSStrokeWidthAttributeName 删除线宽度

NSShadowAttributeName  阴影

1.  使用实例

UILabel *testLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 320, 30)];

testLabel.backgroundColor = [UIColor lightGrayColor];

testLabel.textAlignment = NSTextAlignmentCenter;

NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:@"今天天气不错呀"];

[AttributedStr addAttribute:NSFontAttributeName

value:[UIFont systemFontOfSize:16.0]

range:NSMakeRange(2, 2)];

[AttributedStr addAttribute:NSForegroundColorAttributeName

value:[UIColor redColor]

range:NSMakeRange(2, 2)];

testLabel.attributedText = AttributedStr;

[self.view addSubview:testLabel];

16、加大按钮的点击范围

把UIButton的frame 设置的大一些，然后给UIButton设置一个小些的图片

[tmpBtn setImageEdgeInsets:UIEdgeInsetsMake(5, 5, 5, 5)];

// 注意这里不能用setBackgroundImage

[tmpBtn setImage:[UIImage imageNamed:@"testBtnImage"] forState:UIControlStateNormal];

17、//避免self的强引用

__weak ViewController *weakSelf = self;

18、//类别的创建

command +n ——>Objective-C File———>(File Type  选择是类别还是扩展)———>(Class  选择为哪个控件写类别)

19、修改UITableview 滚动条颜色的方法

self.tableView.indicatorStyle=UIScrollViewIndicatorStyleWhite;

20、利用UIWebView显示pdf文件

webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

[webView setDelegate:self];

[webView setScalesPageToFit:YES];

[webViewsetAutoresizingMask:UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight];

[webView setAllowsInlineMediaPlayback:YES];

[self.view addSubview:webView];

NSString *pdfPath = [[NSBundle mainBundle]pathForResource:@"ojc" ofType:@"pdf"];

NSURL *url = [NSURLfileURLWithPath:pdfPath];

NSURLRequest *request = [NSURLRequestrequestWithURL:url

cachePolicy:NSURLRequestUseProtocolCachePolicy

timeoutInterval:5];

[webView loadRequest:request];

21、将plist文件中的数据赋给数组

NSString *thePath = [[NSBundle mainBundle]pathForResource:@"States" ofType:@"plist"];

NSArray *array = [NSArrayarrayWithContentsOfFile:thePath];

22、隐藏状态栏

[[UIApplication shareApplication]setStatusBarHidden: YES animated:NO]；

23、给navigation  Bar  设置title颜色

UIColor *whiteColor = [UIColor whiteColor];

NSDictionary *dic = [NSDictionary dictionaryWithObject:whiteColor forKey:NSForegroundColorAttributeName];

[self.navigationController.navigationBar setTitleTextAttributes:dic];

24、使用AirDrop 进行分享

NSArray *array = @[@"test1", @"test2"];

UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:array applicationActivities:nil];

[self presentViewController:activityVC animated:YES

completion:^

NSLog(@"Air");

];

25、把tableview里面Cell的小对勾的颜色改成别的颜色

_mTableView.tintColor = [UIColor redColor];

26、UITableView去掉分割线

_tableView.separatorStyle = NO;

27、正则判断手机号码地址格式

- (BOOL)isMobileNumber:(NSString *)mobileNum

//    电信号段:133/153/180/181/189/177

//    联通号段:130/131/132/155/156/185/186/145/176

//    移动号段:134/135/136/137/138/139/150/151/152/157/158/159/182/183/184/187/188/147/178

//    虚拟运营商:170

NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|8[0-9]|7[06-8])\\d8$";

NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];

return [regextestmobile evaluateWithObject:mobileNum];



28、控制交易密码位数

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

if (textField.text.length >=6)

[MBProgressHUD showMessage:@"密码为6位" afterDelay:1.8];

return NO;



return YES;



29、判断是不是空

if ([real_name isKindOfClass:[NSNull class]] )

return NO;

30、点击号码拨打电话

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://400966220"]];

31、控制UITabbar的选择哪一个

[self.tabBarController setSelectedIndex:1];

32、获取当前App的版本号

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

CFShow(infoDictionary);

// app名称

NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];

// app版本

NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

// app build版本

NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];

33、苹果app权限NSPhotoLibraryUsageDescriptionApp需要您的同意,才能访问相册NSCameraUsageDescriptionApp需要您的同意,才能访问相机NSMicrophoneUsageDescriptionApp需要您的同意,才能访问麦克风NSLocationUsageDescriptionApp需要您的同意,才能访问位置NSLocationWhenInUseUsageDescriptionApp需要您的同意,才能在使用期间访问位置NSLocationAlwaysUsageDescriptionApp需要您的同意,才能始终访问位置NSCalendarsUsageDescriptionApp需要您的同意,才能访问日历NSRemindersUsageDescriptionApp需要您的同意,才能访问提醒事项NSMotionUsageDescriptionApp需要您的同意,才能访问运动与健身NSHealthUpdateUsageDescriptionApp需要您的同意,才能访问健康更新NSHealthShareUsageDescriptionApp需要您的同意,才能访问健康分享NSBluetoothPeripheralUsageDescriptionApp需要您的同意,才能访问蓝牙NSAppleMusicUsageDescriptionApp需要您的同意,才能访问媒体资料库

34、控件设置边框

_describText.layer.borderColor = [[UIColor colorWithRed:215.0 / 255.0 green:215.0 / 255.0 blue:215.0 / 255.0 alpha:1] CGColor];

_describText.layer.borderWidth = 1.0;

_describText.layer.cornerRadius = 4.0;

_describText.clipsToBounds = YES;

35、//隐藏电池条的方法

-(BOOL)prefersStatusBarHidden

return YES;



36、延时操作

[NSThread sleepForTimeInterval:2];

方法二：

[self performSelector:@selector(delayMethod) withObject:nil afterDelay:1.5];

37、系统风火轮：

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO; //隐藏

38、//didSelectRowAtIndexPath:方法里面找到当前的Cell

AssessMentCell * cell = [tableView cellForRowAtIndexPath:indexPath];

39、navigation上返回按钮的颜色以及返回按钮后面文字去掉

//返回按钮后边文字去掉

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)

forBarMetrics:UIBarMetricsDefault];

//设置左上角返回按钮的颜色

self.navigationController.navigationBar.tintColor = UIColorFromRGB(0x666666);

40、lineBreakMode //设置文字过长时的显示格式

label.lineBreakMode = NSLineBreakByCharWrapping;以字符为显示单位显

示，后面部分省略不显示。

label.lineBreakMode = NSLineBreakByClipping;剪切与文本宽度相同的内

容长度，后半部分被删除。

label.lineBreakMode = NSLineBreakByTruncatingHead;前面部分文字

以……方式省略，显示尾部文字内容。

label.lineBreakMode = NSLineBreakByTruncatingMiddle;中间的内容

以……方式省略，显示头尾的文字内容。

label.lineBreakMode = NSLineBreakByTruncatingTail;结尾部分的内容

以……方式省略，显示头的文字内容。

label.lineBreakMode = NSLineBreakByWordWrapping;以单词为显示单位显

示，后面部分省略不显示。