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日期选择器，开题报告，支持年、年月、年月日、时分、年月周 时分等。
由于使用UIPickerView的话，开题报告，列表会有个弧度，所以这里用了https://github.com/xiaozhuxiong121/PGPickerView
GitHub地址https://github.com/xiaozhuxiong121/PGDatePicker
CocoaPods安装pod 'PGDatePicker'使用PGDatePicker *datePicker = [[PGDatePicker alloc]init]; datePicker.delegate = self; [datePicker show]; datePicker.datePickerMode = PGDatePickerModeYear; #pragma PGDatePickerDelegate - (void)datePicker:(PGDatePicker *)datePicker didSelectDate:(NSDateComponents *)dateComponents { NSLog(@'dateComponents = %@', dateComponents); }设置Date建议用NSDate+PGCategory类所定义的方法去设置
+ (NSDate *)setYear:(NSUInteger)year; + (NSDate *)setYear:(NSUInteger)year month:(NSUInteger)month; + (NSDate *)setYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day; + (NSDate *)setMonth:(NSUInteger)month day:(NSUInteger)day hour:(NSInteger)hour minute:(NSInteger)minute; + (NSDate *)setHour:(NSInteger)hour minute:(NSInteger)minute;比如：datePicker.maximumDate = [NSDate setYear:2017];
