开发中 可能会用到的一些 方法
关于图片处理（UIImage）
将颜色转化为图片
- (UIImage *)createImageWithColor:(UIColor *) color
{
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
修改图片大小_ OC
- (UIImage *)scaleImage:(UIImage *)img ToSize:(CGSize)itemSize
{
UIImage *i;
// 创建一个bitmap的context,并把它设置成为当前正在使用的context
UIGraphicsBeginImageContext(itemSize);
CGRect imageRect=CGRectMake(0, 0, itemSize.width, itemSize.height);
// 绘制改变大小的图片
[img drawInRect:imageRect];
// 从当前context中创建一个改变大小后的图片
i=UIGraphicsGetImageFromCurrentImageContext();
// 使当前的context出堆栈
UIGraphicsEndImageContext();
// 返回新的改变大小后的图片
return i;
}
修改图片大小-Swift
func scaleImage(img:UIImage,itemSize:CGSize)->UIImage
{
var images=UIImage()
// 创建一个bitmap的context,并把它设置成为当前正在使用的context
UIGraphicsBeginImageContext(itemSize)
// 绘制改变大小的图片
images.drawInRect(CGRectMake(0, 0, itemSize.width, itemSize.height))
// 从当前context中创建一个改变大小后的图片
images = UIGraphicsGetImageFromCurrentImageContext()
// 使当前的context出堆栈
UIGraphicsEndImageContext()
// 返回新的改变大小后的图片
return images
}
裁剪图片圆角_Swift
UIImage的方法
func clipImgRectCorner(direction: UIRectCorner, cornerRadius: CGFloat)->UIImage{
// 1.开启位图上下文，跟图片尺寸一样大
UIGraphicsBeginImageContextWithOptions(self.size, false, 0);
let cornerSize = CGSizeMake(cornerRadius, cornerRadius)
// 2.1创建圆形的路径
let path = UIBezierPath(roundedRect:CGRectMake(0, 0,size.width,size.height), byRoundingCorners: direction, cornerRadii: cornerSize)
// 2.2把路径设置为裁剪区域
path.addClip()
// 3.绘制图片
self.drawAtPoint(CGPointZero);
// 4.从上下文中获取图片
let clipImage = UIGraphicsGetImageFromCurrentImageContext()
// 5.关闭上下文
UIGraphicsEndImageContext();
return clipImage
}
裁剪图片圆角_OC
- (UIImage *)clipImgRectCorner:(UIRectCorner)direction cornerRadius:(CGFloat) cornerRadius{
// 1.开启位图上下文，跟图片尺寸一样大
UIGraphicsBeginImageContextWithOptions(self.size, false, 0);
CGSize cornerSize = CGSizeMake(cornerRadius, cornerRadius);
NSLog(@"%.2f",self.size.height);
// 2.1 创建圆形的路径
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0,self.size.width,self.size.height) byRoundingCorners:direction cornerRadii:cornerSize];
// 2.2把路径设置为裁剪区域
[path addClip];
// 3.绘制图片
[self drawAtPoint:CGPointZero];
// 4.从上下文中获取图片
UIImage * clipImage = UIGraphicsGetImageFromCurrentImageContext();
// 5.关闭上下文
UIGraphicsEndImageContext();
return clipImage;
}
关于字符串（NSString）
去掉空格或换行
- (NSString *)removeSpaceAndNewline:(NSString *)str
{
NSString *temp = [str stringByReplacingOccurrencesOfString:@" " withString:@""];
temp = [temp stringByReplacingOccurrencesOfString:@"\r" withString:@""];
temp = [temp stringByReplacingOccurrencesOfString:@"\n" withString:@""];
return temp;
}
判断当前url是否合法
- (BOOL)isCurrentURLAvaliable:(NSString *)urlstring
{
if (![self isCurrentStringAvailable:urlstring]) {
return NO;
}
NSString * urlFormat = @"^(https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",urlFormat];
if ([predicate evaluateWithObject:urlstring]){
return YES;
}
return NO;
}
验证邮箱是否合法
- (BOOL) isEmail: (NSString *)emaile
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:emaile];
}
判断一个字符串是否可用
- (BOOL)isCurrentStringAvailable:(NSString *)string
{
BOOL available = NO;
if (string && [string isKindOfClass:[NSString class]] && (![string isEqualToString:@""]) && (![string isEqual:[NSNull null]]) && ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length] > 0)){
available = YES;
}
return available;
}
判断一个字符串是否是整型数字
- (BOOL)isPureInt:(NSString *)string
{
BOOL isPure;
NSScanner* scan = [NSScanner scannerWithString:string];
int val;
isPure = [scan scanInt:&val] && [scan isAtEnd];
return isPure;
}
判断一个字符串是否是浮点型数字
- (BOOL)isPureFloat:(NSString *)string
{
BOOL isPure;
NSScanner* scan = [NSScanner scannerWithString:string];
float val;
isPure = [scan scanFloat:&val] && [scan isAtEnd];
return isPure;
}
判断当前手机号是否正确
- (BOOL)isCurrentMobileNumAvailable:(NSString *)mobileStr
{
//字符串是否可用 在上面
if (![self isCurrentStringAvailable:mobileStr]){
return NO;
}
if ([mobileStr length]!= 11){
return NO;
}
NSString *ALL = @"^13[\d]{9}$|^14[5,7]{1}\d{8}$|^15[^4]{1}\d{8}$|^17[0,3,5,6,7,8]{1}\d{8}$|^18[\d]{9}|^19[8,9]\d{8}|^16[6]\d{8}$";
NSPredicate *regextestall = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", ALL];
return [regextestall evaluateWithObject:mobileStr];
}
判断一个字符串是否包含中文
-(BOOL)isCurrentIncludeChinese:(NSString *)str
{
for(int i=0; i< [str length];i++)
{
int a = [str characterAtIndex:i];
if( a >=0x4e00 && a <= 0x9fff)
{
return YES;
}
}
return NO;
}
判断是否全部为中文
-(BOOL)isCurrentIsChinese:(NSString *)str
{
for(int i=0; i< [str length];i++)
{
int a = [str characterAtIndex:i];
if( a >= 0x4e00 && a <= 0x9fff)
{
}else{
return NO;
}
}
return YES;
}
UILable 相关
根据字体大小 和 高度 计算宽度
/**
@prame content 内容
@prame fontSize 字体大小
@prame height 高度
@return 宽度
*/
+ (CGFloat)calculateLableWidth:(NSString *)content
fontSize:(NSUInteger)fontSize
height:(CGFloat)height{
NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]};
CGRect rect = [content boundingRectWithSize:CGSizeMake(0, height)
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:dic context:nil];
return rect.size.width;
}
根据字体大小 和 宽度 计算高度
/**
@prame content 内容
@prame fontSize 字体大小
@prame height 宽度
@return 高度
*/
+ (CGFloat)calculateLableHeight:(NSString *)content
fontSize:(NSInteger)fontSize
width:(CGFloat)width{
NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:fontSize]};
CGRect rect = [content boundingRectWithSize:CGSizeMake(width, 0)
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:dic context:nil];
return rect.size.height;
}