rangeofstring的简单介绍
ios金额输入小数点等问题
- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string {
if([textField.textrangeOfString:@"."].location==NSNotFound)
{
isHaveDian=NO;
}
if([stringlength] 0)
{
unicharsingle = [stringcharacterAtIndex:0];//当前输入的字符
if((single ='0' single ='9') || single =='.')//数据格式正确
{
//首字母不能为0和小数点
if([textField.textlength] ==0)
{
if(single =='.')
{
//[self showMyMessage:@"亲，第一个数字不能为小数点!"];
[textField.textstringByReplacingCharactersInRange:rangewithString:@""];
returnNO;
}
//if (single == '0')
//{
//
////[self showMyMessage:@"亲，第一个数字不能为0!"];
//
//[textField.text stringByReplacingCharactersInRange:range withString:@""];
//
//return NO;
//
//}
}
//输入的字符是否是小数点
if(single =='.')
{
if(!isHaveDian)//text中还没有小数点
{
isHaveDian=YES;
returnYES;
}else{
//[self showMyMessage:@"亲，您已经输入过小数点了!"];
[textField.textstringByReplacingCharactersInRange:rangewithString:@""];
returnNO;
}
}else{
if(isHaveDian) {//存在小数点
//判断小数点的位数
NSRangeran = [textField.textrangeOfString:@"."];
if(range.location- ran.location=2) {
returnYES;
}else{
//[self showMyMessage:@"亲，您最多输入两位小数!"];
returnNO;
}
}else{
returnYES;
}
}
}else{//输入的数据格式不正确
//[self showMyMessage:@"亲，您输入的格式不正确!"];
[textField.textstringByReplacingCharactersInRange:rangewithString:@""];
returnNO;
}
}
else
{
returnYES;
}
}
swift为什么不使用string自带的rangeofstring
请不要使用String自带的rangeOfString方法，而是使用NSString的。
所以可以这么来：
var str: NSString = "abcd";
var loc = str.rangeOfString("bc").location
println("bc location is: \(loc)")
改变字符串中的字体和颜色
/**
*改变字符串中具体某字符串的颜色
*/
+?(void)messageAction:(UILabel*)theLabchangeString:(NSString*)changeandAllColor:(UIColor*)allColorandMarkColor:(UIColor*)markColorandMarkFondSize:(float)fontSize?{
NSString*tempStr?=?theLab.text;
NSMutableAttributedString*strAtt?=?[[NSMutableAttributedStringalloc]initWithString:tempStr];
[strAttaddAttribute:NSForegroundColorAttributeNamevalue:allColorrange:NSMakeRange(0,?[strAttlength])];
NSRange?markRange?=?[tempStrrangeOfString:change];
[strAttaddAttribute:NSForegroundColorAttributeNamevalue:markColorrange:markRange];
[strAttaddAttribute:NSFontAttributeNamevalue:[UIFontfontWithName:@"HelveticaNeue"size:fontSize]range:markRange];
theLab.attributedText=?strAtt;
}
/*
*x*y
*改变字符start?和?end?之间的字符的颜色?和?字体大小
*/
+?(void)messageAction:(UILabel*)theLabstartString:(NSString*)startendString:(NSString*)endandAllColor:(UIColor*)allColorandMarkColor:(UIColor*)markColorandMarkFondSize:(float)fontSize?{
NSString*tempStr?=?theLab.text;
NSMutableAttributedString*strAtt?=?[[NSMutableAttributedStringalloc]initWithString:tempStr];
[strAttaddAttribute:NSForegroundColorAttributeNamevalue:allColorrange:NSMakeRange(0,?[strAttlength])];
//?'x''y'字符的范围
NSRange?tempRange?=?NSMakeRange(0,0);
if([selfjudgeStringIsNull:start])?{
tempRange?=?[tempStrrangeOfString:start];
}
NSRange?tempRangeOne?=?NSMakeRange([strAttlength],0);
if([selfjudgeStringIsNull:end])?{
tempRangeOne?=??[tempStrrangeOfString:end];
}
//?更改字符颜色
NSRange?markRange?=?NSMakeRange(tempRange.location+tempRange.length,?tempRangeOne.location-(tempRange.location+tempRange.length));
[strAttaddAttribute:NSForegroundColorAttributeNamevalue:markColorrange:markRange];
//?更改字体
//?[strAtt?addAttribute:NSFontAttributeName?value:[UIFont?fontWithName:@"HelveticaNeue-Bold"?size:20]?range:NSMakeRange(0,?[strAtt?length])];
[strAttaddAttribute:NSFontAttributeNamevalue:[UIFontfontWithName:@"HelveticaNeue"size:fontSize]range:markRange];
theLab.attributedText=?strAtt;
}
/**
*改变字符串中所有数字的颜色
*/
+?(void)setRichNumberWithLabel:(UILabel*)labelColor:(UIColor*)colorFontSize:(CGFloat)size?{
NSMutableAttributedString*attributedString?=?[[NSMutableAttributedStringalloc]initWithString:label.text];
NSString*temp?=nil;
for(inti?=0;?i??[attributedStringlength];?i++)?{
temp?=?[label.textsubstringWithRange:NSMakeRange(i,1)];
if([selfisPureInt:temp])?{
[attributedStringsetAttributes:[NSDictionarydictionaryWithObjectsAndKeys:
color,?NSForegroundColorAttributeName,
[UIFontsystemFontOfSize:size],NSFontAttributeName,nilnil]
range:NSMakeRange(i,1)];
}
}
label.attributedText=?attributedString;
}
/**
*此方法是用来判断一个字符串是不是整型.
*如果传进的字符串是一个字符,可以用来判断它是不是数字
*/
+?(BOOL)isPureInt:(NSString*)string?{
NSScanner*scan?=?[NSScannerscannerWithString:string];
intvalue;
return[scanscanInt:value]??[scanisAtEnd];
}
/**
*判断字符串是否不全为空
*/
+?(BOOL)judgeStringIsNull:(NSString*)string?{
if([[stringclass]isSubclassOfClass:[NSNumberclass]])?{
returnYES;
}
BOOLresult?=NO;
if(string?!=nil?string.length0)?{
for(inti?=0;?i??string.length;?i?++)?{
NSString*subStr?=?[stringsubstringWithRange:NSMakeRange(i,1)];
if(![subStrisEqualToString:@"?"]??![subStrisEqualToString:@""])?{
result?=YES;
}
}
}
returnresult;
}