一些零碎的知识点。希望能帮到大家，我也是刚入行的小白~

判断密码长度 这里是（6-20位）

#pragma mark -密码长度

- (BOOL) validatePassword:(NSString *)passWord

{

NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";

NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];

return [passWordPredicate evaluateWithObject:passWord];

}

---

打电话

#pragma mark - 打电话

- (void)finshTelPhone

{

//打电话

UIApplication *app = [UIApplication sharedApplication];

[app openURL:[NSURL URLWithString:@"tel://10086"]];

}

倒叙排布

#pragma mark - 倒叙排布

- (void)daoxu

{

NSArray *array = @[@"1",@"2",@"3",@"5",@"6"];

[array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {

NSLog(@"%@",obj);

}];

}

部分字符串替换 *

NSString *originTel = @"13722223333";

NSString *tel = [originTel stringByReplacingCharactersInRange:NSMakeRange(3, 4) withString:@"****"];

NSLog(@"tel:%@",tel);

颜色转图片

/**

* 颜色转图片

*/

-(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 *theImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return theImage;

}

判断字符串是否为空

- (BOOL)isKindOfNullString:(NSString *)string{    if (string==nil||[string isEqualToString:@""]||[string isEqual:[NSNull null]]||[string isKindOfClass:[NSNull class]]||[string isEqualToString:@""])

{

return NO;

}

else{

return YES;

}

}

判断类型是否为空

/**

*  判断类型是否为空

*

*  @param any 任意类型

*

*  @return yes执行 No retrurn

*/

- (BOOL)isNullForid:(id)any

{

if ([any isKindOfClass:[NSNull class]]==YES||[any isEqual:[NSNull null]]==YES||any==nil)

{

return NO;

}

else{

return YES;

}

}

隐藏TableView的滚动条

/**

*  隐藏表的滚动条

*/

- (void)hideTableView:(UITableView *)tableview

{

tableview.showsVerticalScrollIndicator = NO;

}

↑返回顶部

/**

*  返回顶部

*

*  @param tableview

*/

- (void)backToTopButtonWithTableView:(UITableView *)tableview

{

UIButton * btn_GoTop = [UIButton buttonWithType:0];

[btn_GoTop setBackgroundImage:[UIImage imageNamed:@"回到顶部"] forState:UIControlStateNormal];

btn_GoTop.frame = CGRectMake( SCREEN_WIDTH-50, SCREEN_HEIGHT-180, 40, 40);

self.tableview = tableview;

[btn_GoTop addTarget:self action:@selector(GotoTopClick) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn_GoTop];

[self.view bringSubviewToFront:btn_GoTop];

}

按钮 图片上文字下

/**

*  按钮 图片上文字下

*

*  @param btn

*/

-(void)initButton:(UIButton*)btn{

btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;//使图片和文字水平居中显示

[btn setTitleEdgeInsets:UIEdgeInsetsMake(btn.imageView.frame.size.height+20 ,-btn.imageView.frame.size.width, 0.0,0.0)];//文字距离上边框的距离增加imageView的高度，距离左边框减少imageView的宽度，距离下边框和右边框距离不变

[btn setImageEdgeInsets:UIEdgeInsetsMake(0.0, 0.0,0.0, -btn.titleLabel.bounds.size.width)];//图片距离右边框距离减少图片的宽度，其它不边

}

判断手机号

#pragma mark - 判断手机号

// 正则判断手机号码地址格式

- (BOOL)isMobileNumber:(NSString *)mobileNum {

//    电信号段:133/153/180/181/189/177

//    联通号段:130/131/132/155/156/185/186/145/176

//    移动号段:134/135/136/137/138/139/150/151/152/157/158/159/182/183/184/187/188/147/178

//    虚拟运营商:170

NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|8[0-9]|7[06-8])\\d{8}$";

NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];

return [regextestmobile evaluateWithObject:mobileNum];

}