我正在通过原料应用创建配方。当我在文本字段上键入成分然后按下查找食谱按钮时,它会下载含有这些类型成分的食谱,但它会在标签上显示其他成分,我想要做的是显示带有不同颜色的成分的标签。其他成分。
示例代码:
-(void)drawTheCell:(Recipe *)recipeObject {
self.recipeTitle.text = recipeObject.title;
NSArray *dividesString = [recipeObject.ingredients componentsSeparatedByString:@", "];
NSMutableString *listIngreditents;
for (int i=0; i < dividesString.count; i++) {
for(int j=0; i < recipeObject.keywords.count || j < i; j++) {
if ([dividesString objectAtIndex:i] == [recipeObject.keywords objectAtIndex:i]) {
self.recipeIngredients.text = [dividesString objectAtIndex:i];
self.recipeIngredients.textColor = [UIColor greenColor];
[listIngreditents appendString:self.recipeIngredients.text];
NSLog(@"Found a match");
}
else {
[listIngreditents appendString:[dividesString objectAtIndex:i]];
}
}
标签没有显示成分,但确实显示没有成分的食谱。
答案 0 :(得分:1)
除了Fennelouski提到的事实,你没有使用属性字符串,你的逻辑存在很多问题。
你当前的内部循环可能不会按预期执行...基本上,当recipeObject
索引小于当前dividesString
时,内部循环才会执行索引或当前dividesString
索引小于关键字总数,一般来说,通过这种逻辑,您基本上创建了对您尝试完成的内容毫无意义的依赖关系。
相反,您要做的是查看当前dividesString
是否与当前文本字段中的任何关键字匹配,因此如果您希望使用双循环对您尝试的逻辑进行编码,则可以循环执行在外循环的每次迭代中所有关键字,并在内循环完成执行后进行if-else比较,例如:
- (void)drawTheCell:(Recipe *)recipeObject {
self.recipeTitle.text = recipeObject.title;
// Break up the recipe ingredients into components
NSArray *dividesString = [recipeObject.ingredients componentsSeparatedByString:@", "];
// Create a mutable attributed string so you can maintain
// color attributes
NSMutableAttributedString *listIngredients = [[NSMutableAttributedString alloc] init];
// Loop through the ingredient components
for (int i=0; i < dividesString.count; i++) {
// Add a comma if it's not the first ingredient
if (i > 0) {
NSMutableAttributedString *commaString = [[NSMutableAttributedString alloc] initWithString:@", "];
[listIngredients appendAttributedString:commaString];
}
// Create a boolean to indicate whether a keyword match
// has been found
bool matchFound = NO;
// Loop through your "keywords"
for(int j=0; j < recipeObject.keywords.count; j++) {
// If the current ingredient matches the current keyword
// change the matchFound boolean to true
if ([[dividesString objectAtIndex:i] isEqualToString:[recipeObject.keywords objectAtIndex:j]]) {
matchFound = YES;
break;
}
}
NSMutableAttributedString *attString =
[[NSMutableAttributedString alloc] initWithString:[dividesString objectAtIndex:i]];
if (matchFound) {
NSLog(@"Found a match");
// Make the attributed string green
[attString addAttribute:NSForegroundColorAttributeName
value:[UIColor greenColor]
range:NSMakeRange(0, attString.length)];
// Append the ingredient to listIngreditents
[listIngredients appendAttributedString:attString];
}
else {
NSLog(@"Match not found");
// Append the ingredient to listIngreditents
// with the default color
[listIngredients appendAttributedString:attString];
}
}
// Set the label, ex. self.recipeIngredients.attributedText = listIngredients;
}
但是有一个更简单的解决方案 - 我建议完全放弃内循环并使用containsObject:
来查看recipeObject.keywords
数组是否包含当前成分,例如:
- (void)drawTheCell:(Recipe *)recipeObject {
self.recipeTitle.text = recipeObject.title;
// Break up the recipe ingredients into components
NSArray *dividesString = [recipeObject.ingredients componentsSeparatedByString:@", "];
// Create a mutable attributed string so you can maintain
// color attributes
NSMutableAttributedString *listIngredients = [[NSMutableAttributedString alloc] init];
// Loop through the ingredient components
for (int i=0; i < dividesString.count; i++) {
// Add a comma if it's not the first ingredient
if (i > 0) {
NSMutableAttributedString *commaString = [[NSMutableAttributedString alloc] initWithString:@", "];
[listIngredients appendAttributedString:commaString];
}
NSMutableAttributedString *attString =
[[NSMutableAttributedString alloc] initWithAttributedString:[dividesString objectAtIndex:i]];
// If recipeObject.keywords contains the current
// ingredient, add the green attributed string
if([recipeObject.keywords containsObject:[dividesString objectAtIndex:i]]) {
NSLog(@"Found a match");
// Make the attributed string green
[attString addAttribute:NSForegroundColorAttributeName
value:[UIColor greenColor]
range:NSMakeRange(0, attString.length)];
// Append the ingredient to listIngreditents
[listIngredients appendAttributedString:attString];
}
// Else, simply add the string
else {
NSLog(@"Match not found");
// Append the ingredient to listIngreditents
// with the default color
[listIngredients appendAttributedString:attString];
}
}
// Set the label, ex. self.recipeIngredients.attributedText = listIngredients;
}
答案 1 :(得分:0)
你走在正确的轨道上,但是一个主要的问题就是你没有使用NSMutableAttributedString
来阻止你用不同颜色的不同单词。每次要将单词设置为不同的颜色时,都需要将该属性添加到字符串的该部分。
获得格式化的属性字符串后,您需要设置myTextField.attributedText
。