生成一定范围的随机数
-(float)RandomFloatStart:(float)a end:(float)b {
srand((unsigned)time(0));
float random = ((float) rand()) / (float) RAND_MAX;
float diff = b - a;
float r = random * diff;
return a + r;
}
验证邮箱是否合法
- (BOOL) validEmail:(NSString*) emailString {
if([emailString length]==0){
return NO;
}
NSString *regExPattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
NSLog(@"%i", regExMatches);
if (regExMatches == 0) {
return NO;
} else {
return YES;
}
}
判断手机是否越狱
+(BOOL)isJailbroken {
NSString *filePath = @"/Applications/Cydia.app";
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{
return YES;
} else {
return NO;
}
}
or