对CCLabelTTF进行自动换行，显示打字效果
有时候我们在开发cocos2d游戏的时候，会用到任务的对话，或者在做任务的时候跟npc进行对话。这几天正好项目需要，就写了个简单的label，效果就是我们打字一样，一个一个显示出来，自动换行。在我这个例子中，我把总的行数限定4行，根据这个先决条件写了下面的几行代码，仅供参考！！
ary = [NSMutableArray arrayWithCapacity:20];
[ary retain];
int length = [copyStr length];
int line = 1; // 必须要有一行
int wordCount = 0; // 标记第几个字
for (int i = 0; i < length; i++)
{
// 发现回车行数加1
if ([copyStr characterAtIndex:i] == '\n')
{
line++;
//NSLog(@"subStr === %@",[copyStr substringToIndex:i]);
[ary addObject:[copyStr substringToIndex:i]];
//NSLog(@"剩余的字符串:%@",[copyStr substringFromIndex:i+1]);
copyStr = [copyStr substringFromIndex:i+1];
length = [copyStr length];// 截取了回车之前的部分之后，就要从新计算剩余字符串的长度
wordCount = 0;
i = 0;
}
if (wordCount*14 > 300)
{
line++;
//NSLog(@"第一次截取 :%@",[copyStr substringToIndex:wordCount]);
[ary addObject:[copyStr substringToIndex:wordCount]];
copyStr = [copyStr substringFromIndex:wordCount];
//NSLog(@"省下的 === %@",copyStr);
length = [copyStr length];
if (length < kTextCount)
{
[ary addObject:copyStr];
}
//NSLog(@"省下的长度 === %d",length);
wordCount = 0; // 如果发现，到某个字的时候，总的宽度大于了300我们就要手动换行，然后从新开始记数
i = 0; // 从新开始循环变量也要归0
}
//NSLog(@"i == %d",i);
wordCount++;
}
//CGSize size = [kString sizeWithFont:[UIFont fontWithName:@"Arial-BoldMT" size:14] constrainedToSize:CGSizeMake(300, 1000) lineBreakMode:UILineBreakModeWordWrap];
//[self schedule:@selector(setSubString:) interval:0.03];
}
NSMutableArray* array = [NSMutableArray arrayWithCapacity:10];
NSMutableString* mStr = [[NSMutableString alloc] init];
int lineCount = 0;
int maxLine = [ary count];
// 4句话合成一句话
for(NSString* str in ary)
{
[mStr appendString:str];
lineCount++;
if(lineCount%4==0||lineCount>=maxLine)
{
[array addObject:[NSString stringWithFormat:@"%@",mStr]];
[mStr deleteCharactersInRange:NSMakeRange(0, [mStr length])];
}
}
// 获取完之后，由于从新组合了数组，我们把这哥ary清空，从新放入新数组中的对象，就是一个方便
[ary removeAllObjects];
for (int n = 0; n < [array count]; n++)
{
//NSLog(@"array[%d] == %@",n,[array objectAtIndex:n]);
[ary addObject:[array objectAtIndex:n]];
}
// 标记重新组合的字符串在数组中的索引
printID = 0;
[self nextPrint];
return self;
}
-(void)nextPrint
{
// 标记搜索到的字符数
printIndex = 0;
strPrint = [ary objectAtIndex:printID];
// 求拿出来的字符串的长度
maxPrint = [strPrint length];
printID++;
[self schedule:@selector(print:) interval:0.05];
}
-(void)print:(ccTime)step
{
printIndex++;
[self printString:strPrint index:printIndex];
if(printIndex>=maxPrint)
{
[self unschedule:_cmd];
if (printID < [ary count])
{
[self nextPrint];
}
}
}
-(void)printString:(NSString*)str index:(int)index
{
[label setString:[str substringToIndex:index]];
}