iOS - 可以直接用的小代码

避免方法重复执行

//不带参数
[[self class] cancelPreviousPerformRequestsWithTarget:self];
[self performSelector:@selector(text111)  afterDelay:0.3];
//带参数
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(requstRootDataSourceforFileDircevory:) object:models.fileDirId];
[self performSelector:@selector(requstRootDataSourceforFileDircevory:) withObject:models.fileDirId afterDelay:0.3];

1,打印bool值

NSLog(@"ifReadOnly value: %@" ,ifReadOnly?@"YES":@"NO");

2,拨打电话

NSString * number = [NSString stringWithFormat:@"tel://%@",self.lclModel.phoneNo];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:number]];

3,验证码输入

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
//验证码的位数
    NSInteger count = 6;
//    得到输入的字符串
    NSString *aStr = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if (textField == self.enterCodeText) {
        //这里的if时候为了获取删除操作,如果没有次if会造成当达到字数限制后删除键也不能使用的后果.
        if (range.length == 1 && string.length == 0) {
            self.nextPage.enabled = YES;
            [self.nextPage setBackgroundColor:[UIColor grayColor]];
            return YES;
        }else if (aStr.length>=count){
            self.nextPage.enabled = YES;
            self.enterCodeText.text = [aStr substringToIndex:count];
             [self.nextPage setBackgroundColor:color_green];
            return NO;
        }
    }
    return [self validateNumber:string];
}
- (BOOL)validateNumber:(NSString*)number {
    
    BOOL res = YES;
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    int i = 0;
    while (i < number.length) {
        NSString * string = [number substringWithRange:NSMakeRange(i, 1)];
        NSRange range = [string rangeOfCharacterFromSet:tmpSet];
        if (range.length == 0) {
            res = NO;
            break;
        }
        i++;
    }
    return res;
}

iOS中对字典的key进行排序

// 将key排序
NSArray *keys = dictionary.allKeys;
keys = [keys sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
    NSComparisonResult result = [obj1 compare:obj2];
    return result == NSOrderedDescending;
}];

data转化字典

NSDictionary *dict =  [NSJSONSerialization JSONObjectWithData:responseObject options:nil error:nil];

字典转json

// 字典转json字符串方法
-(NSString *)convertToJsonData:(NSDictionary *)dict
{
    
    NSError *error;
    
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
    
    NSString *jsonString;
    
    if (!jsonData) {
        
        NSLog(@"%@",error);
        
    }else{
        
        jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
        
    }
    
    NSMutableString *mutStr = [NSMutableString stringWithString:jsonString];
    
    NSRange range = {0,jsonString.length};
    
    //去掉字符串中的空格
    
    [mutStr replaceOccurrencesOfString:@" " withString:@"" options:NSLiteralSearch range:range];
    
    NSRange range2 = {0,mutStr.length};
    
    //去掉字符串中的换行符
    
    [mutStr replaceOccurrencesOfString:@"\n" withString:@"" options:NSLiteralSearch range:range2];
    return mutStr;
    
}

输入即时搜索

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(beiginSearch) name:UITextFieldTextDidChangeNotification object:self.searchText];
-(void)beiginSearch{
    if (textField.markedTextRange == nil) {
        NSLog(@"需要搜索的内容:%@", self.searchText);
    }
}

masonry动画

//告知需要更改约束
        [self.view setNeedsUpdateConstraints];
        [UIView animateWithDuration:0.3 animations:^{
            [self.baseTableView mas_updateConstraints:^(MASConstraintMaker *make) {
                make.height.offset(40);
                
            }];
            //告知父类控件绘制，不添加注释的这两行的代码无法生效
            [self.view layoutIfNeeded];
        }];