字符串循环追加问题

if(loanTerms && loanTerms.count>0) {

for(inti =0; i < loanTerms.count; i++) {

NSNumber*term = loanTerms[i];

if(contextManager.deadLineArray.count== loanTerms.count) {

break;

}

[contextManager.deadLineArrayaddObject:[[NSStringstringWithFormat:@"%ld", (long)term.integerValue]stringByAppendingString:@"个月"]];

if(i == loanTerms.count-1) {

contextManager.deadLineString= [contextManager.deadLineString stringByAppendingString:term.stringValue];

}else{

contextManager.deadLineString= [contextManager.deadLineString stringByAppendingString:[NSStringstringWithFormat:@"%@/",term.stringValue]];

}

//DebugLog(@"contextManager.deadLineString = %@", contextManager.deadLineString);

}

}

这样一段代码折腾了很长时间

1，[contextManager.deadLineString stringByAppendingString:[NSStringstringWithFormat:@"%@/",term.stringValue]];直接这样是不行的，必须每次将添加后的值返回来：contextManager.deadLineString= [contextManager.deadLineString stringByAppendingString:[NSStringstringWithFormat:@"%@/",term.stringValue]];这样是正确的

2，contextManager.deadLineString不能是空值，如果是空值添加不上

3，-(NSString*)deadLineString

{

if(!_deadLineString) {

_deadLineString=@"";

}

return_deadLineString;

}

这种是最佳处理方式

如果用 NSMutableString的话，赋值时会报警告。