new/二期/Category/NSString+Category.m

//
//  NSString+Category.m
//  乐销
//
//  Created by 刘惠萍 on 2017/3/25.
//  Copyright © 2017年 ping. All rights reserved.
//

#import "NSString+Category.h"

@implementation NSString (Category)
//运行时 安全
+ (void)load{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        
        method_exchangeImplementations(class_getInstanceMethod(self, @selector(substringToIndex:)), class_getInstanceMethod(self, @selector(sldSubstringToIndex:)));
        
        method_exchangeImplementations(class_getClassMethod(self, @selector(substringFromIndex:)), class_getClassMethod(self, @selector(sldSubstringFromIndex:)));
        
    });
}

- (NSString *)sldSubstringToIndex:(NSUInteger)to{
    if (self.length<to) {
        return @"";
    }
    return [self sldSubstringToIndex:to];
}
- (NSString *)sldSubstringFromIndex:(NSUInteger)to{
    if (self.length<to) {
        return @"";
    }
    return [self sldSubstringFromIndex:to];
}

+ (NSNumber * (^)(NSString *))num{
    return ^(NSString *num){
        if (isStr(num)) {
            if ([num doubleValue]) {
                return [NSNumber numberWithDouble:[num doubleValue]];
            }
        }
        return @0;
    };
}
+ (NSString * (^)(NSNumber *))str{
    return ^(NSNumber *num){
        if (isNum(num)) {
            return [NSString stringWithFormat:@"%@",num];
        }
        return @"";
    };
}

+ (NSString * (^)(double))price{
    return ^(double num){
        return [NSString stringWithFormat:@"%.2f",num];
    };
}
+ (NSString * (^)(double))dou{
    return ^(double num){
        return [NSString stringWithFormat:@"%@",[NSNumber numberWithDouble:num]];
    };
}


- (NSString *)smallImage{
    return self.smallImageCustomSize(200);
}
- (NSString *)middleImage{
    return self.smallImageCustomSize(400);
}
//全部有效
+ (BOOL)isAllValid:(NSArray *)aryStrs{
    if (!isAry(aryStrs)) {
        return false;
    }
    for (NSString * strItem in aryStrs) {
        if (!isStr(strItem)) {
            return false;
        }
    }
    return true;
}
//有一个有效
+ (BOOL)isHasOneValid:(NSArray *)aryStrs{
    for (NSString * strItem in aryStrs) {
        if (isStr(strItem)) {
            return true;
        }
    }
    return false;
}

//截取字符串
+ (NSString *)subStr:(NSString *)string num:(NSInteger)num{
    if (!isStr(string)) {
        return @"";
    }
    if (string.length >= num) {
        return [string substringToIndex:num];
    }else{
        return string;
    }
    return @"";
}
//has string in self
- (BOOL)hasString:(NSString *)str{
    if (!isStr(str)) return false;
    NSRange range = [self rangeOfString:str];
    return range.location != NSNotFound;
}

//获取高度
- (CGFloat)fetchHeightWidthLimint:(CGFloat)width fontNum:(CGFloat)fontNum lineSpace:(CGFloat)lineSpace{
    //fetch height
    UIFont * font = [UIFont systemFontOfSize:fontNum];
    CGRect frame = [self boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:lineSpace?@{NSParagraphStyleAttributeName:[NSMutableParagraphStyle initWithLineSpace:lineSpace],NSFontAttributeName:font}:@{NSFontAttributeName:font} context:nil];
    //如果只有一行
    if (lineSpace && CGRectGetHeight(frame) == font.lineHeight + lineSpace) {
        return  font.lineHeight;
    }
    return  CGRectGetHeight(frame);
}


#pragma mark - Base64编码
- (NSString *)base64Encode
{
    //先将string转换成data
    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
    
    NSData *base64Data = [data base64EncodedDataWithOptions:0];
    
    NSString *baseString = [[NSString alloc]initWithData:base64Data encoding:NSUTF8StringEncoding];
    
    return baseString;
}

#pragma mark - Base64解码
- (NSString *)base64Decode
{
    NSData *data = [[NSData alloc]initWithBase64EncodedString:self options:NSDataBase64DecodingIgnoreUnknownCharacters];
    
    NSString *string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    
    return string;
}

@end