How to write this codes in swift?

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a Swift APP using an OBJ-C class, the example in OBJ-C like below:

d1.getData = ^(NSUInteger item) {
    float x = [vals[item] floatValue];
    float y = [vals2[item] floatValue];
    NSString *label1 = [NSString stringWithFormat:@"%d", item];
    NSString *label2 = [NSString stringWithFormat:@"%f", y];
    return [LineChartDataItem dataItemWithX:x y:y xLabel:label1 dataLabel:label2];
};

can't get any idea to deal with d1.getData = ^(NSUInteger item) in Swift!

Addition, at the head of the class:

typedef LineChartDataItem *(^LineChartDataGetter)(NSUInteger item);
@property (copy) LineChartDataGetter getData;

Any help? Thanks.

asked 41 secs ago

jdleung

12

How to write this codes in swift?