IOS语法

2017-07-15

NSDictionary里要用到的类型转换   [NSNumber numberWithInt: 89]

2017-12-10

定义一个Block的写法

typedef void (^BMKLocatingCompletionBlock)(BMKLocation * _Nullable location, BMKLocationNetworkState state , NSError * _Nullable error);

2018-04-04

NSDictionary *ret = @{@"code":@, @"dB": @dB};

报Collection element of type 'double' is not an Objective-C object

改成下面就好了

NSDictionary *ret = @{@"code":@, @"dB": @(dB)};

2018-06-25

[NSString stringWithFormat:@"%@,%@", @"发生错误", [error description]];