ios UITextField 添加内边距 或者修改文字位置

        

[self.startTimeField setValue:[NSNumber numberWithInt:5] forKey:@"paddingTop"];

        [self.startTimeField setValue:[NSNumber numberWithInt:5] forKey:@"paddingLeft"];

        [self.startTimeField setValue:[NSNumber numberWithInt:5] forKey:@"paddingBottom"];

        [self.startTimeField setValue:[NSNumber numberWithInt:5] forKey:@"paddingRight"];