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https://github.com/huang59160537/HCGDatePicker
KSDatePicker HCGDatePickerAppearance *picker = [[HCGDatePickerAppearance alloc]initWithDatePickerMode:DatePickerYearMonthMode completeBlock:^(NSDate *date) { NSString *formatStr = @'yyyy年MM月'; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:formatStr]; NSLog(@'%@',[dateFormatter stringFromDate:date]); }]; // 显示 [picker show];HCGDatePickerAppearance.h样式类，论文，开题报告，可随意自定义。
