UU_Get

1.TextField输入金额限制

#define myDotNumbers     @"0123456789.\n"
#define myNumbers          @"0123456789\n"

// textField输入金额的限制,小数点前9位,后面两位,如果不加小数点,最大位数是9位,加上小数点,最大位数是12位,超出最大位数可删除


- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)      string {
    
    // 判断是否输入内容，或者用户点击的是键盘的删除按钮
    if (![string isEqualToString:@""]) {
        NSCharacterSet *cs;
        // 小数点在字符串中的位置 第一个数字从0位置开始
        
        NSInteger dotLocation = [textField.text rangeOfString:@"."].location;
        
        // 判断字符串中是否有小数点，并且小数点不在第一位
        
        // NSNotFound 表示请求操作的某个内容或者item没有发现，或者不存在
        
        // range.location 表示的是当前输入的内容在整个字符串中的位置，位置编号从0开始
        
        if (dotLocation == NSNotFound && range.location != 0) {
            
            // 取只包含“myDotNumbers”中包含的内容，其余内容都被去掉
            
            /* [NSCharacterSet characterSetWithCharactersInString:myDotNumbers]的作用是去掉"myDotNumbers"中包含的所有内容，只要字符串中有内容与"myDotNumbers"中的部分内容相同都会被舍去在上述方法的末尾加上invertedSet就会使作用颠倒，只取与“myDotNumbers”中内容相同的字符
             */
            cs = [[NSCharacterSet characterSetWithCharactersInString:myDotNumbers] invertedSet];
            if (range.location >= 9) {
                NSLog(@"单笔金额不能超过亿位");
                if ([string isEqualToString:@"."] && range.location == 9) {
                    return YES;
                }
                return NO;
            }
        }else {
            
            cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers] invertedSet];
            
        }
        // 按cs分离出数组,数组按@""分离出字符串
        
        NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
        
        BOOL basicTest = [string isEqualToString:filtered];
        
        if (!basicTest) {
            
            NSLog(@"只能输入数字和小数点");
            
            return NO;
            
        }
        
        if (dotLocation != NSNotFound && range.location > dotLocation + 2) {
            
            NSLog(@"小数点后最多两位");
            
            return NO;
        }
        if (textField.text.length > 11) {
            
            return NO;
            
        }
    }
    
    return YES;
}

2 拖拽约束实现布局动画

@property (weak, nonatomic) IBOutlet NSLayoutConstraint * orderViewHeight;

self.orderViewHeight.constant = 110;
[self.orderView setNeedsUpdateConstraints];
__weak typeof(self) weakSelf = self;
[UIView animateWithDuration:0.4 animations:^{
    [weakSelf.orderView layoutIfNeeded];
}]

3 打电话

NSString *phoneNum = @"15201269722";
NSString *urlStr = [NSString stringWithFormat:@"tel://%@",phoneNum];
NSURL *url = [NSURL URLWithString:urlStr];
[[UIApplication sharedApplication]openURL:url];

4 iOS提交TestFlight测试显示缺少合规证明

在info.plist中增加键值对，ITSAppUsesNonExemptEncryption 设置为NO

5 相机调用后为英文

解决：info.plist里面添加Localized resources can be mixed YES（表示是否允许应用程序获取框架库内语言）

6.获取当前屏幕显示的viewcontroller

//获取当前屏幕显示的viewcontroller
- (UIViewController *)getCurrentVC
{
    UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
    
    UIViewController *currentVC = [self getCurrentVCFrom:rootViewController];
    
    return currentVC;
}

- (UIViewController *)getCurrentVCFrom:(UIViewController *)rootVC
{
    UIViewController *currentVC;
    
    if ([rootVC presentedViewController]) {
        // 视图是被presented出来的
        
        rootVC = [rootVC presentedViewController];
    }
    
    if ([rootVC isKindOfClass:[UITabBarController class]]) {
        // 根视图为UITabBarController
        
        currentVC = [self getCurrentVCFrom:[(UITabBarController *)rootVC selectedViewController]];
        
    } else if ([rootVC isKindOfClass:[UINavigationController class]]){
        // 根视图为UINavigationController
        
        currentVC = [self getCurrentVCFrom:[(UINavigationController *)rootVC visibleViewController]];
        
    } else {
        // 根视图为非导航类
        
        currentVC = rootVC;
    }
    
    return currentVC;
}

7. 内存警告问题

• 1. ARC模式下 CGImage 释放问题
     内存泄漏警告如下：

屏幕快照 2017-08-08 下午2.48.16.png

在ARC模式下 不是什么东西 都可以释放 例如 C-types的对象 都需要手动来进行释放
手动释放 CGImageRelease(subImageRef);

• 2. 使用 SCNetworkReachability和Reachability监测网络连接状态时，调用CFRelease 来释放内存警告的地方

8. 字符串转UTF-8

NSString *str1 = [str stringByAddingPercentEncodingWithAllowedCharacters: [NSCharacterSet URLQueryAllowedCharacterSet]];
//转回去 NSString *str2 = [str1 stringByRemovingPercentEncoding];

9.监听状态栏高度改变的通知(通话或录音状态状态栏多出20）

UIApplicationDidChangeStatusBarFrameNotification

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(layoutControllerSubViews) name:UIApplicationDidChangeStatusBarFrameNotification object:nil];

或者使用

- (void)viewWillLayoutSubviews
- (void)viewDidLayoutSubviews

10.数字金额转大写金额

-(NSString *)digitUppercaseWithMoney:(NSString *)money
{
    NSMutableString *moneyStr=[[NSMutableString alloc] initWithString:[NSString stringWithFormat:@"%.2f",[money doubleValue]]];
    NSArray *MyScale=@[@"分", @"角", @"元", @"拾", @"佰", @"仟", @"万", @"拾", @"佰", @"仟", @"亿", @"拾", @"佰", @"仟", @"兆", @"拾", @"佰", @"仟" ];
    NSArray *MyBase=@[@"零", @"壹", @"贰", @"叁", @"肆", @"伍", @"陆", @"柒", @"捌", @"玖"];
    
    NSArray *integerArray = @[@"拾", @"佰", @"仟", @"万", @"拾万", @"佰万", @"仟万", @"亿", @"拾亿", @"佰亿", @"仟亿", @"兆", @"拾兆", @"佰兆", @"仟兆"];
    
    
    NSMutableString * M = [[NSMutableString alloc] init];
    [moneyStr deleteCharactersInRange:NSMakeRange([moneyStr rangeOfString:@"."].location, 1)];
    for(NSInteger i=moneyStr.length;i>0;i--)
    {
        NSInteger MyData=[[moneyStr substringWithRange:NSMakeRange(moneyStr.length-i, 1)] integerValue];
        [M appendString:MyBase[MyData]];
        
        //判断是否是整数金额
        if (i == moneyStr.length) {
            NSInteger l = [[moneyStr substringFromIndex:1] integerValue];
            if (MyData > 0 &&
                l == 0 ) {
                NSString *integerString = @"";
                if (moneyStr.length > 3) {
                    integerString = integerArray[moneyStr.length-4];
                }
                [M appendString:[NSString stringWithFormat:@"%@%@",integerString,@"元整"]];
                break;
            }
        }
        
        if([[moneyStr substringFromIndex:moneyStr.length-i+1] integerValue]==0
           && i != 1
           && i != 2)
        {
            [M appendString:@"元整"];
            break;
        }
        [M appendString:MyScale[i-1]];
    }
    
    self.label.text = M;
    return M;
}

11.通过view获取Controller

- (UIViewController *)viewController {
    for (UIView* next = [self superview]; next; next = next.superview) {
        UIResponder *nextResponder = [next nextResponder];
        if ([nextResponder isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)nextResponder;
        }
    }
    return nil;
}