iOS 项目总结- 几个常用的分类

1. 给UIColor加的随机颜色的分类，randomcolor 方便项目调试时使用。

randomcolor.h 文件

#import 

@interface UIColor (RandomColor)
+(UIColor*)randomColor;

@end

randomcolor.m文件

#import "randomcolor.h"
@implementation UIColor(RandomColor)
+(UIColor*)randomColor{
    CGFloat hue = ( arc4random() % 256 / 256.0 ); //0.0 to 1.0
    
    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0,away from white
    
    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; //0.5 to 1.0,away from black
    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
}
@end

2.对NSdictionary 进行Mutable深拷贝的分类

NSDictionary-DeepMutableCopy.h 

#import 
/**
 * @brief NSDictionary 深拷贝分类
 */
@interface NSDictionary(DeepMutableCopy)

/**
 * @brief NSDictionary深拷贝
 */
-(NSMutableDictionary *)mutableDeepCopy;
@end

NSDictionary-DeepMutableCopy.m

#import "NSDictionary-DeepMutableCopy.h"


@implementation NSDictionary(DeepMutableCopy)
-(NSMutableDictionary *)mutableDeepCopy
{
    NSMutableDictionary *ret = [[NSMutableDictionary alloc] initWithCapacity:[self count]];
    NSArray *keys = [self allKeys];
    for (id key in keys)
    {
        id oneValue = [self valueForKey:key];
        id oneCopy = nil;
        
        if ([oneValue respondsToSelector:@selector(mutableDeepCopy)])
            oneCopy = [oneValue mutableDeepCopy];
        else if ([oneValue respondsToSelector:@selector(mutableCopy)])
            oneCopy = [oneValue mutableCopy];
        if (oneCopy == nil)
            oneCopy = [oneValue copy];
        [ret setValue:oneCopy forKey:key];
    }
    return ret;
}
@end

3.项目中使用的URL 如果包含中文是无法通过识别的，所以需要把带中文的URL 重新编码

NSString+URL.h

#import 

@interface NSString (URL)
-(NSString*)URLEncodeString;
@end

NSString+URL.m

#import "NSString+URL.h"

@implementation NSString (URL)
-(NSString*)URLEncodeString{
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)self,(CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",NULL,kCFStringEncodingUTF8));
    return encodedString;
}
@end

4.UIColor的分类：从十六进制字符串获取颜色。

UIColor+HEX.h

#import 
#define RGBA_COLOR(R, G, B, A) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:A]
#define RGB_COLOR(R, G, B) [UIColor colorWithRed:((R) / 255.0f) green:((G) / 255.0f) blue:((B) / 255.0f) alpha:1.0f]
@interface UIColor (HEX)

+ (UIColor *)colorWithHexString:(NSString *)color;

//从十六进制字符串获取颜色，
//color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha;
@end

UIColor+HEX.m

#import "UIColor+HEX.h"

@implementation UIColor (HEX)
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha
{
    //删除字符串中的空格
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    // String should be 6 or 8 characters
    if ([cString length] < 6)
    {
        return [UIColor clearColor];
    }
    // strip 0X if it appears
    //如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
    if ([cString hasPrefix:@"0X"])
    {
        cString = [cString substringFromIndex:2];
    }
    //如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
    if ([cString hasPrefix:@"#"])
    {
        cString = [cString substringFromIndex:1];
    }
    if ([cString length] != 6)
    {
        return [UIColor clearColor];
    }
    
    // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
    //r
    NSString *rString = [cString substringWithRange:range];
    //g
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    //b
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}
//默认alpha值为1
+ (UIColor *)colorWithHexString:(NSString *)color
{
    return [self colorWithHexString:color alpha:1.0f];
}
@end

5.label的分类 根据内容获取高度，多用于根据文字内容来确定cell高度。

用法：首先确定label的font和大小，不设置有默认值，然后传入一个cgsize，只要填写所需要的宽度，高度随意填写，会返回所需要的高和宽

UILabel+StringFrame.h

#import 

@interface UILabel (StringFrame)
- (CGSize)boundingRectWithSize:(CGSize)size;
@end

UILabel+StringFrame.m

#import "UILabel+StringFrame.h"

@implementation UILabel (StringFrame)
- (CGSize)boundingRectWithSize:(CGSize)size
{
    NSDictionary *attribute = @{NSFontAttributeName: self.font};
    
    CGSize retSize = [self.text boundingRectWithSize:size
                                             options:\
                      NSStringDrawingTruncatesLastVisibleLine |
                      NSStringDrawingUsesLineFragmentOrigin |
                      NSStringDrawingUsesFontLeading
                                          attributes:attribute
                                             context:nil].size;
    
    return retSize;
}
@end

6.UIImage 的分类：把当前彩色图片转化成灰色

UIImage+grayImage.h

#import 

@interface UIImage (grayImage)
+ (UIImage*)getGrayImage:(UIImage*)sourceImage;
@end

UIImage+grayImage.m

#import "UIImage+grayImage.h"

@implementation UIImage (grayImage)
+ (UIImage*)getGrayImage:(UIImage*)sourceImage
{
    int width = sourceImage.size.width;
    int height = sourceImage.size.height;
    
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
    CGContextRef context = CGBitmapContextCreate (nil,width,height,8,0,colorSpace,kCGBitmapByteOrderDefault);
    CGColorSpaceRelease(colorSpace);
    
    if (context == NULL) {
        return nil;
    }
    
    CGContextDrawImage(context,CGRectMake(0, 0, width, height), sourceImage.CGImage);
    CGImageRef grayImageRef = CGBitmapContextCreateImage(context);
    UIImage *grayImage = [UIImage imageWithCGImage:grayImageRef];
    CGContextRelease(context);
    CGImageRelease(grayImageRef);
    
    return grayImage;
}
@end