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iOS - 开发

1. Xcode在真机调试的时候出现”The identity used to sign the executable is no longer valid”

解决方案：
(1)provisioning Profile文件选择错误
(2)provisioning Profile已失效
(3)开发者证书过期或者被删除了

2. 将storyBoard里的控制器进行实例化

注：需要在Storyboard里面设置控制器的Storyboard ID

//Identifier:@“Storyboard ID”
//将storyBoard实例化 （1）(可以在AppDelegate里面使用)
    UIStoryboard *mainSB = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    //将要跳转控制器通过storyBoard实例化
    ViewController *VC = [mainSB instantiateViewControllerWithIdentifier:@"ViewController"];
    VC.isModifyPassword = NO;
    [self.navigationController pushViewController:VC animated:YES];

//将storyBoard实例化 （2）
//将要跳转控制器通过storyBoard实例化
    ViewController *VC = [self.storyboard  instantiateViewControllerWithIdentifier:@"ViewController"];
    VC.isModifyPassword = NO;
    [self.navigationController pushViewController:VC animated:YES];

3. 仿安卓Toast

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

//声明定义一个ToastLabel对象
@interface ToastLabel : UILabel

- (void)setMessageText:(NSString *)text;

@end

@interface Toast : NSObject
{

    ToastLabel *toastLabel;
    NSTimer *countTimer;
    NSInteger changeCount;
}

//创建声明单例的方法
+ (instancetype)shareInstance;

- (void)makeToast:(NSString *)message duration:(CGFloat )duation;

@end

#import "Toast.h"


@implementation ToastLabel

/**

 * ToastLabel初始化,位label设置各种属性
 *
 * @return ToastLabel

 */

- (instancetype)init{

    self = [super init];
    if (self) {
        self.layer.cornerRadius = 10;
        self.layer.masksToBounds = YES;
        self.backgroundColor = [UIColor blackColor];
        self.numberOfLines = 0;
        self.textAlignment = NSTextAlignmentCenter;
        self.textColor = [UIColor whiteColor];
        self.font = [UIFont systemFontOfSize:15];
    }
    return self;
}

/**
 * 设置显示的文字
 *
 * @aram text 文字文本
 */

- (void)setMessageText:(NSString *)text{
    [self setText:text];

    CGRect rect = [self.text boundingRectWithSize:CGSizeMake(DeviceWidth - 20, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:self.font} context:nil];

    CGFloat width = rect.size.width + 20;
    CGFloat height = rect.size.height + 20;
    CGFloat x = (DeviceWidth - width) / 2;
    CGFloat y = DeviceHight - height - 80;

    self.frame = CGRectMake(x, y, width, height);

}

@end

@implementation Toast

/**
 *  实现声明单例的方法 GCD
 *
 *  @return 单例
 */

+ (instancetype)shareInstance{

    static Toast *singleton = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        singleton = [[Toast alloc] init];

    });

    return singleton;
}

/**
 *  初始化方法
 *
 *  @return 自身
 *
 */

- (instancetype)init{

    self = [super init];
    if (self) {
        toastLabel = [[ToastLabel alloc] init];

        countTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(changeTime) userInfo:nil repeats:YES];
        countTimer.fireDate = [NSDate distantFuture];//关闭定时器
    }

    return self;
}

/**
 *  弹出并显示Tosat
 *
 *  @param message  显示的文本内容
 *  @param duration 显示时间
 */
- (void)makeToast:(NSString *)message duration:(CGFloat)duation{

    if ([message length] == 0) {
        return;
    }
    [toastLabel setMessageText:message];
    [[[UIApplication sharedApplication]keyWindow ] addSubview:toastLabel];

    toastLabel.alpha = 0.8;
    countTimer.fireDate = [NSDate distantPast];//开启定时器
    changeCount = duation;
}

/**
 *   定时器回调方法
 */

- (void)changeTime{

    //NSLog(@"时间:%ld",changeCount);
    if (changeCount-- <= 0) {
        countTimer.fireDate = [NSDate distantFuture];//关闭定时器
        [UIView animateWithDuration:0.2f animations:^{
            toastLabel.alpha = 0;
        } completion:^(BOOL finished) {
            [toastLabel removeFromSuperview];
        }];
    }
}

@end

//duration:显示的时长
[[Toast shareInstance] makeToast:@"你提示的内容" duration:1.0];

4. UITextField的左视图设置

//1.创建UITextField类别

#import <UIKit/UIKit.h>

@interface loginUITextField : UITextField

@end

//2.重写UITextField的左视图的Bounds
#import "loginUITextField.h"

@implementation loginUITextField

- (CGRect)leftViewRectForBounds:(CGRect)bounds

{
    CGRect rect = [super leftViewRectForBounds:bounds];

    if (self.window.frame.size.width == 320) {

        rect = CGRectMake(rect.origin.x + 3, rect.origin.y , 28, 28);

    } else if (self.window.frame.size.width == 375){

        rect = CGRectMake(rect.origin.x + 4, rect.origin.y , 32, 32);

    } else {

        rect = CGRectMake(rect.origin.x + 5, rect.origin.y , 35, 35);
    }

    return rect;
}

@end

//以下是例子  并不能直接使用
//_userTextField的左视图
    UIImageView *useImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"user"]];
    _userImageView.contentMode = UIViewContentModeScaleAspectFit;
    _userTextField.leftView = useImageView;
    _userTextField.leftViewMode = UITextFieldViewModeAlways;
    _userTextField.borderStyle = UITextBorderStyleRoundedRect;

    //修改水印字体颜色和字体大小
    [_userTextField setValue:[UIColor lightGrayColor] forKeyPath:@"_placeholderLabel.textColor"];
    [_userTextField setValue:[UIFont boldSystemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];


    //_passwordTxetField的左视图
    UIImageView *passwdImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"locked"]];
    //passwdImageView.frame = CGRectMake(0, 0, 37, 37);
    _passwordTxetField.contentMode = UIViewContentModeScaleAspectFit;
    _passwordTxetField.leftView = passwdImageView;
    _passwordTxetField.leftViewMode = UITextFieldViewModeAlways;
    _passwordTxetField.borderStyle = UITextBorderStyleRoundedRect;

    //修改水印字体颜色和字体大小
    [_passwordTxetField setValue:[UIColor lightGrayColor] forKeyPath:@"_placeholderLabel.textColor"];
    [_passwordTxetField setValue:[UIFont boldSystemFontOfSize:15] forKeyPath:@"_placeholderLabel.font"];

//注：如果是在xcode8上面 需要在设置替换左视图的imageView的frame  
//如下，打开passwdImageView.frame的注释(因为如果图片太大 左视图在xcode8上面会变形)
//_passwordTxetField的左视图
    UIImageView *passwdImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"locked"]];
    passwdImageView.frame = CGRectMake(0, 0, 37, 37);
    _passwordTxetField.contentMode = UIViewContentModeScaleAspectFit;
    _passwordTxetField.leftView = passwdImageView;
    _passwordTxetField.leftViewMode = UITextFieldViewModeAlways;
    _passwordTxetField.borderStyle = UITextBorderStyleRoundedRect;

5. 自定义NavgationBar的标题和返回按钮无文字的样式和设置NavgationBar的背景图

//自定义NavgationBar的标题
- (void)creatdTitle{
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 45)];
    label.text = @"标题";
    label.font = [UIFont boldSystemFontOfSize:20];
    label.textAlignment = NSTextAlignmentCenter;
    label.textColor = [UIColor whiteColor];
    self.navigationItem.titleView = label;
}

//返回按钮无文字的样式
- (void)createdbackBarButtonItem{
    UIBarButtonItem *newBarButtonItem = [[UIBarButtonItem alloc] init];
    newBarButtonItem.title = @"";
    self.navigationItem.backBarButtonItem = newBarButtonItem;
    [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];
}

//设置NavgationBar的背景图 (jpg记得加后缀)
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"1"] forBarMetrics:UIBarMetricsDefault];

6. 自定义UIAlertController的标题、内容、和按钮的字体样式

- （void)created{

    NSString *str = @"注  销";

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:str preferredStyle:UIAlertControllerStyleAlert];

    NSMutableAttributedString *alertControllerStr = [[NSMutableAttributedString alloc] initWithString:str];

    [alertControllerStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0, str.length)];
    [alertControllerStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:25] range:NSMakeRange(0, str.length)];

        [alertController setValue:alertControllerStr forKey:@"attributedMessage"];

    UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {



    }];

    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    }];
    [cancelAction setValue:[UIColor grayColor] forKey:@"titleTextColor"]; 

    [alertController addAction:confirmAction];
    [alertController addAction:cancelAction];

    [self presentViewController:alertController animated:YES completion:nil];

}

7. 验证码倒计时60S(注意UIButton样式不能用系统的会闪)

//self.verificationBtn:改成你自己的命名的button

- (void)startTime{
    __block int timeout = 59; //倒计时时间
    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){ //倒计时结束，关闭
            dispatch_source_cancel(_timer);
            dispatch_async(dispatch_get_main_queue(), ^{
                //设置界面的按钮显示 根据自己需求设置（倒计时结束后调用）
                [self.verificationBtn setTitle:@"获取验证码" forState:UIControlStateNormal];
                [self.verificationBtn setBackgroundColor:[UIColor colorWithRed: 0/256.0 green: 111/256.0 blue: 255/256.0 alpha:1]];

                //设置可点击
                self.verificationBtn.userInteractionEnabled = YES;

            });
        }else{
            // int minutes = timeout / 60;    //这里注释掉了，这个是用来测试多于60秒时计算分钟的。
            int seconds = timeout % 60;
            NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
            dispatch_async(dispatch_get_main_queue(), ^{
                //设置界面的按钮显示 根据自己需求设置
                //NSLog(@"____%@",strTime);
                [UIView beginAnimations:nil context:nil];
                [UIView setAnimationDuration:1];

                [self.verificationBtn setTitle:[NSString stringWithFormat:@"%@秒重新发送",strTime] forState:UIControlStateNormal];
                [UIView commitAnimations];
                self.verificationBtn.backgroundColor = [UIColor lightGrayColor];
                //设置不可点击
                self.verificationBtn.userInteractionEnabled = NO;

            });

            timeout--;
        }
    });

    dispatch_resume(_timer);

}

8. 各种切圆角(基本上能切得都这样切)

    //头像图片切圆
    _userImageView.layer.cornerRadius = _userImageView.frame.size.width / 2;
    _userImageView.layer.masksToBounds = YES;

    //
    _textFiled.layer.cornerRadius = 10;
    _textFiled.layer.masksToBounds = YES;

    //
    view.layer.cornerRadius = 20;
    view.layer.masksToBounds = YES;

9.避免程序因为NSNull而导致奔溃

//创建个类别
#import <Foundation/Foundation.h>

@interface NSNull (IsNull)

@end

#import "NSNull+IsNull.h"

@implementation NSNull (IsNull)

- (void)forwardInvocation:(NSInvocation *)invocation

{

    if ([self respondsToSelector:[invocation selector]]) {

        [invocation invokeWithTarget:self];

    }

}


- (NSMethodSignature *)methodSignatureForSelector:(SEL)selector

{

    NSMethodSignature *sig = [[NSNull class] instanceMethodSignatureForSelector:selector];

    if(sig == nil) {

        sig = [NSMethodSignature signatureWithObjCTypes:"@^v^c"];

    }

    return sig;

}

@end

10.AFNetworking的一个小问题(获取数据的类型不对时，进行更改)

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/plain",@"text/html",@"image/jpg",nil];