iOS开发小知识点整理第二期（持续更新）
1.根据时间戳显示不同的时间，如果是今年的时间，则显示月日时分秒，如果是今天的时间，显示时分秒，如果不是今年的时间，则显示年月日时分秒
NSTimeIntervaltime = [timerInterval doubleValue]/1000;
NSDate *currentDate=[NSDate dateWithTimeIntervalSince1970:time];
//判断是否是今年
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy";
NSString *nowYear = [fmt stringFromDate:[NSDate date]];
NSString *selfYear = [fmt stringFromDate:currentDate];
if ([nowYear isEqualToString:selfYear]) {//是今年
//判断是否是今天
NSDateFormatter *fmt1 = [[NSDateFormatter alloc] init];
fmt1.dateFormat = @"yyyyMMdd";
NSString *nowString = [fmt1 stringFromDate:[NSDate date]];
NSString *selfString = [fmt1 stringFromDate:currentDate];
if ([nowString isEqualToString:selfString]) {//是今天 显示时分秒
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"HH:mm:ss"];
return [dateformatter stringFromDate:currentDate];
}else{//不是今天 显示月日 时分秒
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"MM-dd HH:mm:ss"];
return [dateformatter stringFromDate:currentDate];
}}else{//不是今年，返回时间的格式为年月日形式
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
return [dateformatter stringFromDate:currentDate];
}
2.将16进制的字符串转换为UIColor的方法
+ (UIColor *)colorWithHexString:(NSString *)hexColorString {
if ([hexColorString length] < 6) { //长度不合法
return [UIColor blackColor];
}
NSString *tempString = [hexColorString lowercaseString];
if ([tempString hasPrefix:@"0x"]) { //检查开头是0x
tempString = [tempString substringFromIndex:2];
} else if ([tempString hasPrefix:@"#"]) { //检查开头是#
tempString = [tempString substringFromIndex:1];
}
if ([tempString length] != 6) {
return [UIColor blackColor];
}
//分解三种颜色的值
NSRange range = NSMakeRange(0, 2);
NSString *rString = [tempString substringWithRange:range];
range.location = 2;
NSString *gString = [tempString substringWithRange:range];
range.location = 4;
NSString *bString = [tempString substringWithRange:range];
//取三种颜色值
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];
}
3.获取网络视频的时间，将其转换为时分格式
- (NSString *)getVideoInfoWithSourcePath:(NSString *)path{
AVURLAsset * asset = [AVURLAsset assetWithURL:[NSURL URLWithString:path]];
CMTimetime = [asset duration];
int seconds = ceil(time.value/time.timescale);
int second = seconds % 60;
int minutes = (seconds / 60) % 60;
return [NSString stringWithFormat:@"%02d:%02d", minutes, second];
}4.裁剪网络图片，使其显示在控件上不变形
+(UIImage *)getImageFromUrl:(NSURL *)imgUrl imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height{UIImage * newImage = [self getImageFromUrl:imgUrl imgViewWidth:width imgViewHeight:height];
return newImage;
}
//裁剪图片
- (UIImage *)cutImage:(UIImage*)image imgViewWidth:(CGFloat)width imgViewHeight:(CGFloat)height
{
//压缩图片CGSize newSize;
CGImageRef imageRef = nil;
if ((image.size.width / image.size.height) < (width / height)) {newSize.width = image.size.width;
newSize.height = image.size.width * height /width;
imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));
} else {newSize.height = image.size.height;
newSize.width = image.size.height * width / height;
imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));
}
return [UIImage imageWithCGImage:imageRef];
}
5.图片裁剪
-(UIImage *) scaleImage: (UIImage *)image scaleFactor:(float)scaleBy
{
if (image.size.width>1000) {
scaleBy = 1000/image.size.width;
}else{
scaleBy= 1.0;
}
CGSize size = CGSizeMake(image.size.width * scaleBy, image.size.height * scaleBy);
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformScale(transform, scaleBy, scaleBy);
CGContextConcatCTM(context, transform);
[image drawAtPoint:CGPointMake(0.0f, 0.0f)];
UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newimg;
}6.将时间字符串转换为时间戳（format必需和时间字符串时间的格式保持一致）
-(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
NSDate *date = [dateFormatter dateFromString:formatTime];
//时间转时间戳的方法:NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];
NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp);
//时间戳的值
return timeSp;
}
7.判断手机号的合法性
+ (BOOL)isMobileNumber:(NSString *)mobileNum
{
if (mobileNum.length != 11)
{
return NO;
}
/**
* 手机号码:
* 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[0, 1, 6, 7, 8], 18[0-9]
* 移动号段: 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
* 联通号段: 130,131,132,145,155,156,170,171,175,176,185,186
* 电信号段: 133,149,153,170,173,177,180,181,189
*/
NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|7[0135678]|8[0-9])\\d{8}$";
/**
* 中国移动：China Mobile
* 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
*/
NSString *CM = @"^1(3[4-9]|4[7]|5[0-27-9]|7[08]|8[2-478])\\d{8}$";
/**
* 中国联通：China Unicom
* 130,131,132,145,155,156,170,171,175,176,185,186
*/
NSString *CU = @"^1(3[0-2]|4[5]|5[56]|7[0156]|8[56])\\d{8}$";
/**
* 中国电信：China Telecom
* 133,149,153,170,173,177,180,181,189
*/
NSString *CT = @"^1(3[3]|4[9]|53|7[037]|8[019])\\d{8}$";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum] == YES)
|| ([regextestcm evaluateWithObject:mobileNum] == YES)
|| ([regextestct evaluateWithObject:mobileNum] == YES)
|| ([regextestcu evaluateWithObject:mobileNum] == YES))
{
return YES;
}
else
{
return NO;
}
}
8.将字符串进行MD5加密
+ (NSString *)md5EncryptWithString:(NSString *)string {return [self md5:[NSString stringWithFormat:@"%@", string]];
}+ (NSString *)md5:(NSString *)string{
const char *cStr = [string UTF8String];
unsigned char digest[CC_MD5_DIGEST_LENGTH];
CC_MD5(cStr, (CC_LONG)strlen(cStr), digest);
NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for (int i = 0;
i < CC_MD5_DIGEST_LENGTH;
i++) {
[result appendFormat:@"%02X", digest[i]];
}NSLog(@"----%@",result);
return result;
}9.手机类型的判断
+ (NSString *)iphoneType {struct utsname systemInfo;
uname(&systemInfo);
NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
if ([platform isEqualToString:@"iPhone9,1"]) return @"iPhone 7";
if ([platform isEqualToString:@"iPhone9,2"]) return @"iPhone 7 Plus";
if ([platform isEqualToString:@"iPod1,1"])return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"])return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"])return @"iPod Touch 3G";
if ([platform isEqualToString:@"iPod4,1"])return @"iPod Touch 4G";
if ([platform isEqualToString:@"iPod5,1"])return @"iPod Touch 5G";
if ([platform isEqualToString:@"iPad1,1"])return @"iPad 1G";
if ([platform isEqualToString:@"iPad2,1"])return @"iPad 2";
if ([platform isEqualToString:@"iPad2,2"])return @"iPad 2";
if ([platform isEqualToString:@"iPad2,3"])return @"iPad 2";
if ([platform isEqualToString:@"iPad2,4"])return @"iPad 2";
if ([platform isEqualToString:@"iPad2,5"])return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,6"])return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,7"])return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad3,1"])return @"iPad 3";
if ([platform isEqualToString:@"iPad3,2"])return @"iPad 3";
if ([platform isEqualToString:@"iPad3,3"])return @"iPad 3";
if ([platform isEqualToString:@"iPad3,4"])return @"iPad 4";
if ([platform isEqualToString:@"iPad3,5"])return @"iPad 4";
if ([platform isEqualToString:@"iPad3,6"])return @"iPad 4";
if ([platform isEqualToString:@"iPad4,1"])return @"iPad Air";
if ([platform isEqualToString:@"iPad4,2"])return @"iPad Air";
if ([platform isEqualToString:@"iPad4,3"])return @"iPad Air";
if ([platform isEqualToString:@"iPad4,4"])return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,5"])return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,6"])return @"iPad Mini 2G";
if ([platform isEqualToString:@"i386"])return @"iPhone Simulator";
if ([platform isEqualToString:@"x86_64"])return @"iPhone Simulator";
return platform;
}
10.UITableView分类添加方法，实现没有数据界面展示
-(NSInteger)showImageWithName:(NSString *)imageName
showMessageWithTitle:(NSString *)title
byDataArrayCount:(NSInteger)count
withTop:(CGFloat)top
withImageWidth:(CGFloat)imageWidth
withImageHeight:(CGFloat)imageHeigt {if (count == 0) {self.backgroundView = ({UIView *backView = [[UIView alloc] init];
backView.frame = self.backgroundView.frame;
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = [UIImage imageNamed:imageName];
[backView addSubview:imageView];
UILabel *label = [[UILabel alloc] init];
label.text = title;
[UILabel setLabelTextColor:UIColorFromRGBValue(0x959595) AndFontSize:[self autoScaleW:14] WithLabel:label];
label.textAlignment = NSTextAlignmentCenter;
[backView addSubview:label];
[imageView mas_makeConstraints:^(MASConstraintMaker *make) {make.leading.equalTo(backView).offset((screenW - [self autoScaleW:imageWidth])/2);
make.top.equalTo([self autoScaleH:top]);
make.width.equalTo([self autoScaleW:imageWidth]);
make.height.equalTo([self autoScaleH:imageHeigt]);
}];
[label mas_makeConstraints:^(MASConstraintMaker *make) {make.top.equalTo(imageView.bottom).equalTo(10);
make.leading.equalTo(0);
make.width.equalTo(screenW);
make.height.equalTo(21);
}];
backView;
});
}else{self.backgroundView = nil;
}return count;
}
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