iOS小技巧3

将颜色合成图片

将颜色合成图片
+(UIImage *)imageWithColor:(UIColor *)color
{
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

navigationController 设置title 颜色

    [self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                                     [UIColor whiteColor], UITextAttributeTextColor,
                                                                     nil, UITextAttributeTextShadowColor,
                                                                     [NSValue valueWithUIOffset:UIOffsetMake(, )], UITextAttributeTextShadowOffset,
                                                                     [UIFont fontWithName:@"Arial-Bold" size:0.0], UITextAttributeFont,
                                                                     nil]];

设置全局navigation barbuttonitem 

#pragma mark 设置全局navigation barbuttonitem
-(void)setNaviBarButtonItemImage:(NSString *)imageName andX:(NSInteger)x andY:(NSInteger)y andW:(NSInteger)w andH:(NSInteger)h andTitle:(NSString *)title andSel:(SEL)sel andLOrR:(NSString *)lOr andTitleColor:(UIColor *)color{ 

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame =CGRectMake(x,y,w,h); 

    [btn setTitle:title forState:UIControlStateNormal]; 

    if (imageName.length== && title.length==) { 

    } else if (imageName.length== && title.length!=) {
        [btn setBackgroundColor:[UIColor clearColor]];
        [btn setTitleColor:color forState:UIControlStateNormal];
    }else if(imageName.length!= && title.length==){
        UIImage *image = [UIImage imageNamed:imageName];
        [btn setImage:image forState:UIControlStateNormal];
    }else if(imageName.length!= && title.length!=){
        UIImage *image = [UIImage imageNamed:imageName];
        [btn setBackgroundImage:image forState:UIControlStateNormal];
        [btn setBackgroundColor:[UIColor clearColor]];
        [btn setTitleColor:color forState:UIControlStateNormal];
    } 

    [btn addTarget: self action:sel forControlEvents: UIControlEventTouchUpInside];
    UIBarButtonItem *bBtn = [[UIBarButtonItem alloc]initWithCustomView:btn]; 

    if ([lOr isEqualToString:@"left"]) {
        [self.navigationItem setLeftBarButtonItem:bBtn];
    }else{
        [self.navigationItem setRightBarButtonItem:bBtn];
    }
}

设置导航条标题的颜色

[navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];

计算文字的Size

/**

 *  计算文字尺寸

 *  @param text    需要计算尺寸的文字

 *  @param font    文字的字体

 *  @param maxSize 文字的最大尺寸

 */

- (CGSize)sizeWithText:(NSString *)text font:(UIFont *)font maxSize:(CGSize)maxSize

{

    NSDictionary *attrs = @{NSFontAttributeName : font};

    return [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;

}

两种方法删除NSUserDefaults所有记录

//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

//方法二
- (void)resetDefaults {
    NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];
    NSDictionary * dict = [defs dictionaryRepresentation];
    for (id key in dict) {
        [defs removeObjectForKey:key];
    }
    [defs synchronize];
}

设置Label行间距

设置label的行间距，计算高度
-(void)fuwenbenLabel:(UILabel *)labell FontNumber:(id)font AndLineSpacing:(float)lineSpacing
{
    //富文本设置文字行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init];
    paragraphStyle.lineSpacing = lineSpacing;

    NSDictionary *attributes = @{ NSFontAttributeName:font, NSParagraphStyleAttributeName:paragraphStyle};
    labell.attributedText = [[NSAttributedString alloc]initWithString:labell.text attributes:attributes];
}

 //获取设置文本间距以后的高度
            CGRect huiDaSize = [cell.fabiaoHuifuContentLabel.attributedText boundingRectWithSize:CGSizeMake(, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin context:nil];

一行代码创建AlertView，支持多个参数

一行代码创建AlertView，支持多个参数
//
//  UIAlertView+Additions.h
//
//
//  Created by Jueying on 15/1/15.
//  Copyright (c) 2015年 Jueying. All rights reserved.
//

#import <UIKit/UIKit.h>

typedef void(^UIAlertViewCallBackBlock)(NSInteger buttonIndex);

@interface UIAlertView (Additions) <UIAlertViewDelegate>

@property (nonatomic, copy) UIAlertViewCallBackBlock alertViewCallBackBlock;

+ (void)alertWithCallBackBlock:(UIAlertViewCallBackBlock)alertViewCallBackBlock title:(NSString *)title message:(NSString *)message  cancelButtonName:(NSString *)cancelButtonName otherButtonTitles:(NSString *)otherButtonTitles, ...;

@end

//
//  UIAlertView+Additions.m
//
//
//  Created by Jueying on 15/1/15.
//  Copyright (c) 2015年 Jueying. All rights reserved.
//

#import "UIAlertView+Additions.h"
#import <objc/runtime.h>

static void* UIAlertViewKey = @"UIAlertViewKey";

@implementation UIAlertView (Additions)

+ (void)alertWithCallBackBlock:(UIAlertViewCallBackBlock)alertViewCallBackBlock title:(NSString *)title message:(NSString *)message  cancelButtonName:(NSString *)cancelButtonName otherButtonTitles:(NSString *)otherButtonTitles, ... {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:cancelButtonName otherButtonTitles: otherButtonTitles, nil];
    NSString *other = nil;
    va_list args;
    if (otherButtonTitles) {
        va_start(args, otherButtonTitles);
        while ((other = va_arg(args, NSString*))) {
            [alert addButtonWithTitle:other];
        }
        va_end(args);
    }
    alert.delegate = alert;
    [alert show];
    alert.alertViewCallBackBlock = alertViewCallBackBlock;
}

- (void)setAlertViewCallBackBlock:(UIAlertViewCallBackBlock)alertViewCallBackBlock {

    [self willChangeValueForKey:@"callbackBlock"];
    objc_setAssociatedObject(self, &UIAlertViewKey;, alertViewCallBackBlock, OBJC_ASSOCIATION_COPY);
    [self didChangeValueForKey:@"callbackBlock"];
}

- (UIAlertViewCallBackBlock)alertViewCallBackBlock {

    return objc_getAssociatedObject(self, &UIAlertViewKey;);
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    if (self.alertViewCallBackBlock) {
        self.alertViewCallBackBlock(buttonIndex);
    }
}

@end

一段文字设置多种字体颜色

给定range和需要设置的颜色，就可以给一段文字设置多种不同的字体颜色，使用方法如下:
[self fuwenbenLabel:contentLabel FontNumber:[UIFont systemFontOfSize:] AndRange:NSMakeRange(, ) AndColor:RGBACOLOR(, , , )];
//设置不同字体颜色
-(void)fuwenbenLabel:(UILabel *)labell FontNumber:(id)font AndRange:(NSRange)range AndColor:(UIColor *)vaColor
{
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:labell.text];

    //设置字号
    [str addAttribute:NSFontAttributeName value:font range:range];

    //设置文字颜色
    [str addAttribute:NSForegroundColorAttributeName value:vaColor range:range];

    labell.attributedText = str;
}

隐藏状态栏

-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [[UIApplication sharedApplication] setStatusBarHidden:NO];

}
-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];
}

ScaleTableView-头部图片可伸缩的TableView

很多社交App中都有这样的设计。 列表顶部是一张大图，大图可以随着列表的下拉而放大。本Demo实现了这个功能。
//
//  ViewController.m
//  ScaleTableView
//
//  Created by ShawnPan on 15/3/25.
//  Mail : developerpans@163.com
//  Copyright (c) 2015年 ShawnPan. All rights reserved.
//

#import "ViewController.h"
#define Imgwidth 828
#define Imgheight 589
#define ScaleImageViewHeight ([UIScreen mainScreen].bounds.size.width*Imgheight/Imgwidth)
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,UIScrollViewDelegate>
@property (strong, nonatomic) IBOutlet UIImageView *scaleImageView;
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) IBOutlet UIImageView *noScaleImage;
@property (strong, nonatomic) IBOutlet UILabel *nicknameLabel;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;

}
- (void)viewWillAppear:(BOOL)animated
{
    self.tableView.contentInset = UIEdgeInsetsMake(ScaleImageViewHeight, , , );
    self.scaleImageView.frame = CGRectMake(, -ScaleImageViewHeight, self.view.frame.size.width, ScaleImageViewHeight);
    [self.tableView addSubview:self.scaleImageView];
    self.noScaleImage.frame = CGRectMake(, -, , );
    [self.tableView addSubview:self.noScaleImage];
    self.nicknameLabel.frame = CGRectMake(, -, , );
    [self.tableView addSubview:self.nicknameLabel];
}

#pragma - mark UIScrollView Delegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
   CGFloat y = scrollView.contentOffset.y;
    if (y < -ScaleImageViewHeight)
    {
        CGRect frame = self.scaleImageView.frame;
        frame.size.height = -y;
        frame.origin.y = y;
        self.scaleImageView.frame = frame;
    }
}

#pragma - mark UITableView DataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return ;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    cell.textLabel.text = [@(indexPath.row) stringValue];
    return cell;
}
@end

//将状态栏文字颜色变成黑色
-(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    if (is_IOS_7) {//更改时间颜色
        [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];
    }
}

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    if (is_IOS_7) {//更改时间颜色
        [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];
    }
}

在tabbar上添加小红点

在tabbar上添加类似于badgevalue功能的小红点。
只需要知道tabbar的下标
使用- (void)showBadgeOnItemIndex:(int)index
和 - (void)hideBadgeOnItemIndex:(int)index进行显示和隐藏
使用方法如下：[self.tabBarController.tabBar showBadgeOnItemIndex:];
#import "UITabBar+badge.h"

#define TabbarItemNums 4.0    //tabbar的数量

@implementation UITabBar (badge)

- (void)showBadgeOnItemIndex:(int)index{

    [self removeBadgeOnItemIndex:index];

    UIView *badgeView = [[UIView alloc]init];

    badgeView.tag =  + index;

    badgeView.layer.cornerRadius = ;

    badgeView.backgroundColor = [UIColor redColor];

    CGRect tabFrame = self.frame;

    float percentX = (index +0.6) / TabbarItemNums;

    CGFloat x = ceilf(percentX * tabFrame.size.width);

    CGFloat y = ceilf(0.1 * tabFrame.size.height);

    badgeView.frame = CGRectMake(x, y, , );

    [self addSubview:badgeView];

}

- (void)hideBadgeOnItemIndex:(int)index{

    [self removeBadgeOnItemIndex:index];

}

- (void)removeBadgeOnItemIndex:(int)index{

    for (UIView *subView in self.subviews) {

        if (subView.tag == +index) {

            [subView removeFromSuperview];

        }
    }
}

@end

获取一个类的所有子类

通过objc_copyClassList获取所有类，并通过class_getSuperclass来判断那类型继承于该类
+ (NSArray *) allSubclasses
{
    Class myClass = [self class];
    NSMutableArray *mySubclasses = [NSMutableArray array];

    unsigned int numOfClasses;
    Class *classes = objc_copyClassList(&numOfClasses;);
    for (unsigned int ci = ; ci < numOfClasses; ci++) {
        Class superClass = classes[ci];
        do {
            superClass = class_getSuperclass(superClass);
        } while (superClass && superClass != myClass);

        if (superClass)
            [mySubclasses addObject: classes[ci]];
    }
    free(classes);

    return mySubclasses;
}

类似广告的文字循环滚动

-(void)viewDidLoad
{
    timer = [[NSTimer alloc] init];

      mainsco = [[UIScrollView alloc] initWithFrame:CGRectMake(, , , )];
        mainsco.backgroundColor = [UIColor clearColor];
        [bgView addSubview:mainsco];
        //显示广告内容
        noticeLabel = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
        noticeLabel.numberOfLines = ;
        noticeLabel.font = [UIFont systemFontOfSize:13.0f];
        noticeLabel.backgroundColor = [UIColor clearColor];
        [mainsco addSubview:noticeLabel];

  noticeLabel.text =[dic valueForKey:@"Bulletin"];

    noticeSize = [ [dic valueForKey:@"Bulletin"] sizeWithFont:[UIFont systemFontOfSize:13.0f] constrainedToSize:CGSizeMake(, )];
//所有文字显示在一行所占的高度
    size1 = [[dic valueForKey:@"Bulletin"] sizeWithFont:[UIFont systemFontOfSize:13.0f]];
   mainsco.contentSize = CGSizeMake(, noticeSize.height);
    mainsco.showsVerticalScrollIndicator = NO;
／／根据文字的多少设置label的宽高,但底层的scrollview只显示一行内容的高度
    noticeLabel.frame = CGRectMake(, , , noticeSize.height);

    mainsco.frame =CGRectMake(, , , size1.height);
    if (noticeSize.height>size1.height)
    {
    //如果文字大于一行就开始滚动，否则停止timer
          timer =  [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(time) userInfo:self repeats:YES];

    }else{
        [timer invalidate];
    }
｝
//滚动的方法
-(void)time
{
    //oldy用来记录上一次scrollview滚动的位置
    mainsco.contentOffset = CGPointMake(, oldy);
    if (oldy>noticeSize.height-) {
        oldy = ;
    }else
        oldy++;／／设置每次滚动的高度，即几个像素
}

分组列表头部空白处理

在viewWillAppear里面添加如下代码：
//分组列表头部空白处理
    CGRect frame = myTableView.tableHeaderView.frame;
    frame.size.height = 0.1;
    UIView *headerView = [[UIView alloc] initWithFrame:frame];
    [myTableView setTableHeaderView:headerView];

阿拉伯数字转化为汉语数字
+(NSString *)translation:(NSString *)arebic

{   NSString *str = arebic;
    NSArray *arabic_numerals = @[@"",@"",@"",@"",@"",@"",@"",@"",@"",@""];
    NSArray *chinese_numerals = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"零"];
    NSArray *digits = @[@"个",@"十",@"百",@"千",@"万",@"十",@"百",@"千",@"亿",@"十",@"百",@"千",@"兆"];
    NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];

    NSMutableArray *sums = [NSMutableArray array];
    for (int i = ; i < str.length; i ++) {
        NSString *substr = [str substringWithRange:NSMakeRange(i, )];
        NSString *a = [dictionary objectForKey:substr];
        NSString *b = digits[str.length -i-];
        NSString *sum = [a stringByAppendingString:b];
        if ([a isEqualToString:chinese_numerals[]])
        {
            if([b isEqualToString:digits[]] || [b isEqualToString:digits[]])
            {
                sum = b;
                if ([[sums lastObject] isEqualToString:chinese_numerals[]])
                {
                    [sums removeLastObject];
                }
            }else
            {
                sum = chinese_numerals[];
            }

            if ([[sums lastObject] isEqualToString:sum])
            {
                continue;
            }
        }

        [sums addObject:sum];
    }

    NSString *sumStr = [sums  componentsJoinedByString:@""];
    NSString *chinese = [sumStr substringToIndex:sumStr.length-];
    NSLog(@"%@",str);
    NSLog(@"%@",chinese);
    return chinese;
}

切割字符串工具。。

字符串~`!@#$%^&*()_-+={}[]|\\:;\"'<,>.?/ 打印结果为 @"~",@"`",@"!",@"@",@"#",@"$",@"%",@"^",@"&",@"*",@"(",@")",@"_",@"-",@"+",@"=",@"{",@"}",@"[",@"]",@"|",@"\",@":",@";",@""",@"'",@"<",@",",@">",@".",@"?",@"/"
// QWERTYUIOPASDFGHJKLZXCVBNM
    NSMutableString *str = [NSMutableString stringWithString:@"~`!@#$%^&*()_-+={}[]|\\:;\"'<,>.?/"];
    NSMutableString *dest = [NSMutableString string];
    for (int i = ; i < str.length; i++) {
        NSMutableString *head = [NSMutableString stringWithString:@"@\""];
        NSString *temp = [str substringWithRange:NSMakeRange(i, 1)];
        [head appendFormat:@"%@\"",temp];

        [dest appendFormat:@"%@,",head];
        NSLog(@"%d", i);
    }
    NSLog(@"%@", dest);

仿iOS图标抖动

#import "LHViewController.h"
#define angelToRandian(x)  ((x)/180.0*M_PI)
@interface LHViewController ()
@property (strong, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation LHViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.
    UILongPressGestureRecognizer* longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
    [self.imageView addGestureRecognizer:longPress];
}

-(void)longPress:(UILongPressGestureRecognizer*)longPress
{
    if (longPress.state==UIGestureRecognizerStateBegan) {
        CAKeyframeAnimation* anim=[CAKeyframeAnimation animation];
        anim.keyPath=@"transform.rotation";
        anim.values=@[@(angelToRandian(-)),@(angelToRandian()),@(angelToRandian(-))];
        anim.repeatCount=MAXFLOAT;
        anim.duration=0.2;
        [self.imageView.layer addAnimation:anim forKey:nil];
        self.btn.hidden=NO;
    }
}

- (IBAction)delete:(id)sender {
    [self.imageView removeFromSuperview];
    [self.btn removeFromSuperview];
}
@end

//修改webView背景色
                    webView.backgroundColor = [UIColor clearColor];
                    [webView setOpaque:NO];

//自定义cell实际大小获取
- (void)awakeFromNib {
    // Initialization code

}

-(void)drawRect:(CGRect)rect {
    // 重写此方法，并在此方法中获取
    CGFloat width = self.frame.size.width;
}

//获取网络图片的宽度
 headerImageView.contentMode = UIViewContentModeScaleAspectFit;
[headerScrollView addSubview:headerImageView];

int imgWidth = headerImageView.image.size.width;
                int imgHight = headerImageView.image.size.height;

                int aWidth = headerImageView.image.size.width/headerImageView.frame.size.width;

                int LastWidth = imgWidth/aWidth;
                int LastHight = imgHight/aWidth;

//视频暂停图片
                UIImageView *imageee = [[UIImageView alloc] initWithFrame:CGRectMake((SCREEN_WIDTH-)/, (SCREEN_HEIGHT-)/, /, /)];
                imageee.image = LOAD_IMAGE(@"newhouse_mov_stop");
                imageee.center = headerImageView.center;
                [headerScrollView addSubview:imageee];

                UIButton *movbtn = [[UIButton alloc] initWithFrame:CGRectMake(+i*SCREEN_WIDTH, , LastWidth, LastHight)];
                movbtn.backgroundColor = [UIColor clearColor];
                movbtn.tag = +i;
                [movbtn addTarget:self action:@selector(doBoFang:) forControlEvents:UIControlEventTouchUpInside];
                movbtn.center = headerImageView.center;
                [headerScrollView addSubview:movbtn];

//获取当前屏幕显示的viewcontroller
- (UIViewController *)getCurrentVC
{
    UIViewController *result = nil;  

    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal)
    {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for(UIWindow * tmpWin in windows)
        {
            if (tmpWin.windowLevel == UIWindowLevelNormal)
            {
                window = tmpWin;
                break;
            }
        }
    }  

    UIView *frontView = [[window subviews] objectAtIndex:];
    id nextResponder = [frontView nextResponder];  

    if ([nextResponder isKindOfClass:[UIViewController class]])
        result = nextResponder;
    else
        result = window.rootViewController;  

    return result;
} 

UILABLE自适应

CGRect rect = [operation boundingRectWithSize:CGSizeMake(SCREEN_WIDTH, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:],NSFontAttributeName,nil] context:nil];

Xcode编译错误集锦
、在将ios项目进行Archive打包时，Xcode提示以下错误：
[BEROR]CodeSign error: Certificate identity ‘iPhone Distribution: ***.’ appears more than once in the keychain. The codesign tool requires there only be one.
原因：那么出现此问题的原因是多个证书之间冲突造成两种解决方法如下：
解决办法：打开mac系统的“实用工具”-“钥匙串访问”-“我的证书”中，会看到有证书名一模一样的，那么请将早期的证书删除掉，重启Xcode；

、在真机或者模拟器编译程序的时候可能会遇到下面的错误：
Could not change executable permissions on the application.
原因：拥有相同的bundle Identifier已经在设备上运行
解决办法：删除设备中或者模拟器中的App。

、编译时遇到如下错误：
A valid provisioning profile matching the application's Identifier 'XXXX' could not be found
原因：缺少证书或者是在Code Signing Identity处没有选择对应的证书或者是证书不对应
解决办法：重装证书，检查证书是否是否选择是否对应。

、编译时遇到如下错误：
ld: library not found for -lmp3lameclang: error: linker command failed with exit code  (use -v to see invocation)
原因：一般是多人编辑同一个工程时其中一人没将某个库上传导致的
解决办法：上传具体静态库
 

//导航栏色调

self.navigationBar.barTintColor = [UIColor colorWithRed:0.01 green:0.05 blue:0.06 alpha:]; //%%% bartint
    self.navigationBar.translucent = NO;
    viewControllerArray = [[NSMutableArray alloc]init];
    currentPageIndex = ;

//设置状态栏颜色

-(UIStatusBarStyle)preferredStatusBarStyle{
    return UIStatusBarStyleLightContent;

//    return UIStatusBarStyleDefault;
}