年前加过年这段时间，公司的项目时间紧非常忙，加上自己在做一个iOS的小项目，下班和周末时间就基本没有休息了，这样博客也就懈怠了。
这里就稍稍总结了一些我写这个小项目时候用上的一些代码片段。一来是给自己做个备忘，二来分享出来希望对大家也有帮助。
//通过图片Data数据第一个字节 来获取图片扩展名
- (NSString *)contentTypeForImageData:(NSData *)data {
uint8_t c;
[data getBytes:&c length:1];
switch (c) {
case 0xFF:
return @"jpeg";
case 0x89:
return @"png";
case 0x47:
return @"gif";
case 0x49:
case 0x4D:
return @"tiff";
case 0x52:
if ([data length] < 12) {
return nil;
}
NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) {
return @"webp";
}
return nil;
}
return nil;
}
/** 设置圆形图片(放到分类中使用) */
- (UIImage *)cutCircleImage {
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0);
// 获取上下文
CGContextRef ctr = UIGraphicsGetCurrentContext();
// 设置圆形
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextAddEllipseInRect(ctr, rect);
// 裁剪
CGContextClip(ctr);
// 将图片画上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
#define SWWeakSelf(type) __weak typeof(type) weak##type = type;
#define SWToast(str) [NSString stringWithFormat:@"%@",str]
// AFNetworking 3.0 设置http头
AFHTTPSessionManager *manger = [AFHTTPSessionManager manager];
AFHTTPRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
NSDictionary *headerFieldValueDictionary = @{@"version":@"1.0"};
if (headerFieldValueDictionary != nil) {
for (NSString *httpHeaderField in headerFieldValueDictionary.allKeys) {
NSString *value = headerFieldValueDictionary[httpHeaderField];
[requestSerializer setValue:value forHTTPHeaderField:httpHeaderField];
}
}
manger.requestSerializer = requestSerializer;
[manger GET:@"url" parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
}];
// 单例
+ (SWString *)sharedManager{
static SWString *shared = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shared = [[self alloc]init];
});
return shared;
}
// 检测网络状态
AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
[manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
//这里是监测到网络改变的block
//在里面可以随便写事件
switch (status) {
case AFNetworkReachabilityStatusUnknown:
SWLog(@"未知网络状态");
break;
case AFNetworkReachabilityStatusNotReachable:
SWLog(@"无网络");
break;
case AFNetworkReachabilityStatusReachableViaWWAN:
SWLog(@"蜂窝数据网");
break;
case AFNetworkReachabilityStatusReachableViaWiFi:
SWLog(@"WiFi网络");
break;
default:
break;
}
}] ;
// NSDate转NSString
+ (NSString *)nowDataString{
NSDate *date = [NSDate date];
NSDateFormatter *objDateformat = [[NSDateFormatter alloc] init];
[objDateformat setDateFormat:@"yyyyMMddHHmmss"];
return [objDateformat stringFromDate: date];
}
// ios md5
#import <CommonCrypto/CommonDigest.h>
- (NSString *)MD5:(NSString *)mdStr
{
const char *original_str = [mdStr UTF8String];
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5(original_str, strlen(original_str), result);
NSMutableString *hash = [NSMutableString string];
for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
[hash appendFormat:@"%02X", result[i]];
return [hash lowercaseString];
}
// ios des加解密
#import <CommonCrypto/CommonCryptor.h>
+ (NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key
{
NSString *ciphertext = nil;
const char *textBytes = [plainText UTF8String];
NSUInteger dataLength = [plainText length];
unsigned char buffer[1024];
memset(buffer, 0, sizeof(char));
Byte iv[] = {1,2,3,4,5,6,7,8};
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
kCCOptionPKCS7Padding,
[key UTF8String], kCCKeySizeDES,
iv,
textBytes, dataLength,
buffer, 1024,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
ciphertext = [[[NSString alloc] initWithData:[GTMBase64 encodeData:data] encoding:NSUTF8StringEncoding] autorelease];
}
return ciphertext;
}
//解密
+ (NSString *) decryptUseDES:(NSString*)cipherText key:(NSString*)key
{
NSData* cipherData = [GTMBase64 decodeString:cipherText];
unsigned char buffer[1024];
memset(buffer, 0, sizeof(char));
size_t numBytesDecrypted = 0;
Byte iv[] = {1,2,3,4,5,6,7,8};
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
kCCAlgorithmDES,
kCCOptionPKCS7Padding,
[key UTF8String],
kCCKeySizeDES,
iv,
[cipherData bytes],
[cipherData length],
buffer,
1024,
&numBytesDecrypted);
NSString* plainText = nil;
if (cryptStatus == kCCSuccess) {
NSData* data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];
plainText = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
}
return plainText;
}
