项目中常用的方法

/*拼接post请求的网址/

- (NSString *)urlDictToStringWithUrlStr:(NSString *)urlStr WithDict:(NSDictionary *)parameters{
if (!parameters) {
    return urlStr;
}
NSMutableArray *parts = [NSMutableArray array];
//enumerateKeysAndObjectsUsingBlock会遍历dictionary并把里面所有的key和value一组一组的展示给你，每组都会执行这个block 这其实就是传递一个block到另一个方法，在这个例子里它会带着特定参数被反复调用，直到找到一个ENOUGH的key，然后就会通过重新赋值那个BOOL *stop来停止运行，停止遍历同时停止调用block
[parameters enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
    //接收key
    NSString *finalKey = [key stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    //接收值
    NSString *finalValue = [obj stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    NSString *part =[NSString stringWithFormat:@"%@=%@",finalKey,finalValue];
    
    [parts addObject:part];
    
}];
NSString *queryString = [parts componentsJoinedByString:@"&"];
queryString = queryString ? [NSString stringWithFormat:@"?%@",queryString] : @"";
NSString *pathStr = [NSString stringWithFormat:@"%@?%@",urlStr,queryString];
return pathStr;
}

/*检查是否包含特殊字符/

- (BOOL)isChineseCharacterAndLettersAndNumbersAndUnderScore:(NSString *)string
{
NSString *other = @"";
NSInteger len = string.length;
for(int i=0;i<len;i++)
{
    unichar a=[string characterAtIndex:i];
    if(!((isalpha(a))
         ||(isalnum(a))
         ||((a=='_'))
         ||((a >= 0x4e00 && a <= 0x9fa6))
         ||([other rangeOfString:string].location != NSNotFound)
         ||((a=='@'))
         ||((a=='#'))
         ))
        return NO;
}
return YES;
}

/*蔡勒公式（根据年月日获得周几）/

- (NSString *)getWeek:(NSInteger)y month:(NSInteger)m day:(NSInteger)d{
NSInteger c = 0;
if (m ==1 || m ==2){
    c = ( y - 1 ) / 100;
    y = ( y - 1 ) % 100;
    m = m + 12;
}else {
    c = y / 100;
    y = y % 100;
}
NSInteger iWeek = y + y / 4 + c / 4 - 2 * c + 26 * ( m + 1 ) / 10 + d - 1;    //蔡勒公式
iWeek = iWeek >= 0 ? ( iWeek % 7 ) : ( iWeek % 7 + 7 );    //iWeek为负时取模
NSString *weekstr = @"";
switch(iWeek)
{
    case 0: weekstr = @"星期日"; break;
    case 1: weekstr = @"星期一"; break;
    case 2: weekstr = @"星期二"; break;
    case 3: weekstr = @"星期三"; break;
    case 4: weekstr = @"星期四"; break;
    case 5: weekstr = @"星期五"; break;
    case 6: weekstr = @"星期六"; break;
}
return weekstr;
}

/*十六进制颜色转换/

+ (UIColor *)colorWithHexString:(NSString *)color
{
NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

if ([cString length] < 6) {
    return [UIColor clearColor];
}

if ([cString hasPrefix:@"0X"])
    cString = [cString substringFromIndex:2];
if ([cString hasPrefix:@"#"])
    cString = [cString substringFromIndex:1];
if ([cString length] != 6)
{
    return [UIColor clearColor];
    
}

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:1.0f];
}

/*UIColor分类 随机色/

+(UIColor*) randomColor{
CGFloat hue = arc4random() % 256 / 256.0; //色调随机:0.0 ~ 1.0
CGFloat saturation = (arc4random() % 128 / 256.0) + 0.5; //饱和随机:0.5 ~ 1.0
CGFloat brightness = (arc4random() % 128 / 256.0) + 0.5; //亮度随机:0.5 ~ 1.0
return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
}