LVGL学习 lv_label

// 调用方式 lv_label_set_text(label,"Hello World"); // 换行模式 直接加 \n lv_label_set_text(label,"Hello\nWorld\n");  // 原型 /** * Set a new text for a label. Memory will be allocated to store the text by the label. * @param label pointer to a label object * @param text '\0' terminated character string. NULL to refresh with the current text. */ void lv_label_set_text(lv_obj_t * obj, const char * text); 

// 调用方式 lv_label_set_text_fmt(label,"%s,%d","String",15);  // 原型 /** * Set a new formatted text for a label. Memory will be allocated to store the text by the label. * @param label pointer to a label object * @param fmt `printf`-like format * @example lv_label_set_text_fmt(label1, "%d user", user_num); */ void lv_label_set_text_fmt(lv_obj_t * obj, const char * fmt, ...) LV_FORMAT_ATTRIBUTE(2, 3); 

// 调用方式 const char * constText = "Hello World"; // 这里要放全局常量 // static const char * constText = "Hello World"; // 或者是这样 lv_label_set_text_static(label,constText); // 调用

// 原型
/** * Set a static text. It will not be saved by the label so the 'text' variable * has to be 'alive' while the label exists. * @param label pointer to a label object * @param text pointer to a text. NULL to refresh with the current text. */
void lv_label_set_text_static(lv_obj_t * obj, const char * text);

文本内容如果大于label元素宽高，就需要做一些调整

lv_label_set_recolor(label,true);     // 开启着色模式
// 开启文本着色模式后 可以用一下方式设置文本的颜色 颜色和文本用 #包住
lv_label_set_text(label,"#颜色1 文本1# , #颜色2 文本2# , #颜色3 文本3#");	// 设置文本

// 原型
/** * Enable the recoloring by in-line commands * @param label pointer to a label object * @param en true: enable recoloring, false: disable * @example "This is a #ff0000 red# word" */
void lv_label_set_recolor(lv_obj_t * obj, bool en);

在 lv_conf.h 启用了 LV_LABEL_TEXT_SELECTION，就可以选择部分文本。在 PC 上使用鼠标选择文本时类似。 但这个效果仅支持 lv_textarea lv_label 仅支持用以下函数事先手动选择文本

lv_label_get_text_selection_start(label, start_char_index);
lv_label_get_text_selection_end(label, end_char_index);

// 原型

/** * @brief Get the selection start index. * @param obj pointer to a label object. * @return selection start index. `LV_LABEL_TEXT_SELECTION_OFF` if nothing is selected. */
uint32_t lv_label_get_text_selection_start(const lv_obj_t * obj);

/** * @brief Get the selection end index. * @param obj pointer to a label object. * @return selection end index. `LV_LABEL_TXT_SEL_OFF` if nothing is selected. */
uint32_t lv_label_get_text_selection_end(const lv_obj_t * obj);

lv_label_set_text(label,LV_SYMBOL_…);	// 直接设置文本土ICON名称 可以显示一个图标

// 图标的宏定义
#define LV_SYMBOL_AUDIO "\xef\x80\x81" /*61441, 0xF001*/
#define LV_SYMBOL_VIDEO "\xef\x80\x88" /*61448, 0xF008*/
#define LV_SYMBOL_LIST "\xef\x80\x8b" /*61451, 0xF00B*/
#define LV_SYMBOL_OK "\xef\x80\x8c" /*61452, 0xF00C*/
#define LV_SYMBOL_CLOSE "\xef\x80\x8d" /*61453, 0xF00D*/
#define LV_SYMBOL_POWER "\xef\x80\x91" /*61457, 0xF011*/
#define LV_SYMBOL_SETTINGS "\xef\x80\x93" /*61459, 0xF013*/
#define LV_SYMBOL_HOME "\xef\x80\x95" /*61461, 0xF015*/
#define LV_SYMBOL_DOWNLOAD "\xef\x80\x99" /*61465, 0xF019*/
#define LV_SYMBOL_DRIVE "\xef\x80\x9c" /*61468, 0xF01C*/
#define LV_SYMBOL_REFRESH "\xef\x80\xa1" /*61473, 0xF021*/
#define LV_SYMBOL_MUTE "\xef\x80\xa6" /*61478, 0xF026*/
#define LV_SYMBOL_VOLUME_MID "\xef\x80\xa7" /*61479, 0xF027*/
#define LV_SYMBOL_VOLUME_MAX "\xef\x80\xa8" /*61480, 0xF028*/
#define LV_SYMBOL_IMAGE "\xef\x80\xbe" /*61502, 0xF03E*/
#define LV_SYMBOL_ENVELOPE "\xef\x83\xa0" /*61664, 0xF0E0*/
#define LV_SYMBOL_EDIT "\xef\x8C\x84" /*62212, 0xF304*/
#define LV_SYMBOL_TINT "\xef\x81\x83" /*61507, 0xF043*/
#define LV_SYMBOL_PREV "\xef\x81\x88" /*61512, 0xF048*/
#define LV_SYMBOL_PLAY "\xef\x81\x8b" /*61515, 0xF04B*/
#define LV_SYMBOL_PAUSE "\xef\x81\x8c" /*61516, 0xF04C*/
#define LV_SYMBOL_STOP "\xef\x81\x8d" /*61517, 0xF04D*/
#define LV_SYMBOL_NEXT "\xef\x81\x91" /*61521, 0xF051*/
#define LV_SYMBOL_EJECT "\xef\x81\x92" /*61522, 0xF052*/
#define LV_SYMBOL_LEFT "\xef\x81\x93" /*61523, 0xF053*/
#define LV_SYMBOL_RIGHT "\xef\x81\x94" /*61524, 0xF054*/
#define LV_SYMBOL_PLUS "\xef\x81\xa7" /*61543, 0xF067*/
#define LV_SYMBOL_MINUS "\xef\x81\xa8" /*61544, 0xF068*/
#define LV_SYMBOL_EYE_OPEN "\xef\x81\xae" /*61550, 0xF06E*/
#define LV_SYMBOL_EYE_CLOSE "\xef\x81\xb0" /*61552, 0xF070*/
#define LV_SYMBOL_WARNING "\xef\x81\xb1" /*61553, 0xF071*/
#define LV_SYMBOL_SHUFFLE "\xef\x81\xb4" /*61556, 0xF074*/
#define LV_SYMBOL_UP "\xef\x81\xb7" /*61559, 0xF077*/
#define LV_SYMBOL_DOWN "\xef\x81\xb8" /*61560, 0xF078*/
#define LV_SYMBOL_LOOP "\xef\x81\xb9" /*61561, 0xF079*/
#define LV_SYMBOL_DIRECTORY "\xef\x81\xbb" /*61563, 0xF07B*/
#define LV_SYMBOL_UPLOAD "\xef\x82\x93" /*61587, 0xF093*/
#define LV_SYMBOL_CALL "\xef\x82\x95" /*61589, 0xF095*/
#define LV_SYMBOL_CUT "\xef\x83\x84" /*61636, 0xF0C4*/
#define LV_SYMBOL_COPY "\xef\x83\x85" /*61637, 0xF0C5*/
#define LV_SYMBOL_SAVE "\xef\x83\x87" /*61639, 0xF0C7*/
#define LV_SYMBOL_BARS "\xef\x83\x89" /*61641, 0xF0C9*/
#define LV_SYMBOL_CHARGE "\xef\x83\xa7" /*61671, 0xF0E7*/
#define LV_SYMBOL_PASTE "\xef\x83\xAA" /*61674, 0xF0EA*/
#define LV_SYMBOL_BELL "\xef\x83\xb3" /*61683, 0xF0F3*/
#define LV_SYMBOL_KEYBOARD "\xef\x84\x9c" /*61724, 0xF11C*/
#define LV_SYMBOL_GPS "\xef\x84\xa4" /*61732, 0xF124*/
#define LV_SYMBOL_FILE "\xef\x85\x9b" /*61787, 0xF158*/
#define LV_SYMBOL_WIFI "\xef\x87\xab" /*61931, 0xF1EB*/
#define LV_SYMBOL_BATTERY_FULL "\xef\x89\x80" /*62016, 0xF240*/
#define LV_SYMBOL_BATTERY_3 "\xef\x89\x81" /*62017, 0xF241*/
#define LV_SYMBOL_BATTERY_2 "\xef\x89\x82" /*62018, 0xF242*/
#define LV_SYMBOL_BATTERY_1 "\xef\x89\x83" /*62019, 0xF243*/
#define LV_SYMBOL_BATTERY_EMPTY "\xef\x89\x84" /*62020, 0xF244*/
#define LV_SYMBOL_USB "\xef\x8a\x87" /*62087, 0xF287*/
#define LV_SYMBOL_BLUETOOTH "\xef\x8a\x93" /*62099, 0xF293*/
#define LV_SYMBOL_TRASH "\xef\x8B\xad" /*62189, 0xF2ED*/
#define LV_SYMBOL_BACKSPACE "\xef\x95\x9A" /*62810, 0xF55A*/
#define LV_SYMBOL_SD_CARD "\xef\x9F\x82" /*63426, 0xF7C2*/
#define LV_SYMBOL_NEW_LINE "\xef\xA2\xA2" /*63650, 0xF8A2*/

lvgl自带有1000个中文字体 可以在 lv_conf.h 里打开

// @lv_conf.h 
...
#define LV_FONT_MONTSERRAT_48 0

/* Demonstrate special features */
#define LV_FONT_MONTSERRAT_12_SUBPX 0
#define LV_FONT_MONTSERRAT_28_COMPRESSED 0 /*bpp = 3*/
#define LV_FONT_DEJAVU_16_PERSIAN_HEBREW 0 /*Hebrew, Arabic, Perisan letters and all their forms*/
#define LV_FONT_SIMSUN_16_CJK 1 /*1000 most common CJK radicals*/ // 【这里改成1】

/* Pixel perfect monospace fonts */
#define LV_FONT_UNSCII_8 0
#define LV_FONT_UNSCII_16 0
...

然后就可以使用中文字体了

lv_obj_set_style_text_font(label, &lv_font_simsun_16_cjk,0);    // 设置系统自带的中文字体
lv_label_set_text(label,"你好世界 Hello World");	// 设置文本

需要准备两样东西 字体文件 and 字体转换器 lvgl官方字体转换器地址：https://

lvgl.io/tools/fontconverter

常用495个汉字

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常用3500个汉字