PBL_IF_ROUND_ELSE函数的问题

Question

I'm trying to follow the tutorial about Watchfaces creation, but I'm stuck. I copied the code from the wiki so there shouldn't be any error whatsoever, but I'm getting this error while compiling

error: implicit declaration of function 'PBL_IF_ROUND_ELSE' [-Werror=implicit-function-declaration]

I tried to google it but I couldn't find anything useful. This is the code

#include <pebble.h>

static Window *s_main_window;
static TextLayer *s_time_layer;

static void update_time() {
  // Get a tm structure
  time_t temp = time(NULL); 
  struct tm *tick_time = localtime(&temp);

  // Write the current hours and minutes into a buffer
  static char s_buffer[8];
  strftime(s_buffer, sizeof(s_buffer), clock_is_24h_style() ? "%H:%M" : "%I:%M", tick_time);

  // Display this time on the TextLayer
  text_layer_set_text(s_time_layer, s_buffer);
}

static void tick_handler(struct tm *tick_time, TimeUnits units_changed) {
  update_time();
}

static void main_window_load(Window *window) {
  // Get information about the Window
  Layer *window_layer = window_get_root_layer(window);
  GRect bounds = layer_get_bounds(window_layer);

  // Create the TextLayer with specific bounds
  s_time_layer = text_layer_create(
      GRect(0, PBL_IF_ROUND_ELSE(58, 52), bounds.size.w, 50));

  // Improve the layout to be more like a watchface
  text_layer_set_background_color(s_time_layer, GColorClear);
  text_layer_set_text_color(s_time_layer, GColorBlack);
  text_layer_set_text(s_time_layer, "00:00");
  text_layer_set_font(s_time_layer, fonts_get_system_font(FONT_KEY_BITHAM_42_BOLD));
  text_layer_set_text_alignment(s_time_layer, GTextAlignmentCenter);

  // Add it as a child layer to the Window's root layer
  layer_add_child(window_layer, text_layer_get_layer(s_time_layer));
}

static void main_window_unload(Window *window) {
  // Destroy TextLayer
  text_layer_destroy(s_time_layer);
}


static void init() {
  // Create main Window element and assign to pointer
  s_main_window = window_create();

  // Set handlers to manage the elements inside the Window
  window_set_window_handlers(s_main_window, (WindowHandlers) {
    .load = main_window_load,
    .unload = main_window_unload
  });

  // Show the Window on the watch, with animated=true
  window_stack_push(s_main_window, true);

  // Make sure the time is displayed from the start
  update_time();

  // Register with TickTimerService
  tick_timer_service_subscribe(MINUTE_UNIT, tick_handler);
}

static void deinit() {
  // Destroy Window
  window_destroy(s_main_window);
}

int main(void) {
  init();
  app_event_loop();
  deinit();
}

I'm using the CloudPebble SDK.

Answer 1

我知道了，PBL_IF_ROUND_ELSE仅适用于3.X SDK（我使用的是2.X）。

Answer 2

" PBL_IF_ROUND_ELSE(58, 52) " Only works with Pebble Time or SDK3 .

You can replace " PBL_IF_ROUND_ELSE(58, 52) " with a range between 0 and 100. 0 meaning it will be at the top of the screen. 100 means it will be at the bottom of the screen.

Answer 3

Replace the "PBL_IF_ROUND_ELSE(58, 52)" with a 0. That should do the trick. Im assuming you are trying to run this program on the aplite version?