iOS实用小技巧

1. 获取控件在屏幕上的位置

@interface LFAddressView()
@property (nonatomic, assign) CGRect rectAddress;
@end
//.m
/**
* 获取控件在屏幕上的位置
*/
UIWindow * window=[[[UIApplication sharedApplication] delegate] window];
self.rectAddress = [btn convertRect: btn.bounds toView:window];

2.字典转Json

最好写在分类里,一般上传都要用到

.h
+ (NSString *)dicToJson:(NSDictionary *)dic;
.m
+ (NSString *)dicToJson:(NSDictionary *)dic{
//dict转jsonData
NSData *jsonData = [NSJSONSerialization dataWithJSONObject: dic options:kNilOptions error:0];
//jsonData转String
NSString *jsonStr = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
return jsonStr;
}

3.日期字符串的降序排序

- (NSArray *)sortArray:(NSArray *)array{
NSStringCompareOptions comparisonOption = NSCaseInsensitiveSearch|NSNumericSearch|NSWidthInsensitiveSearch;
NSComparator sort = ^(NSString *obj1,NSString *obj2){
return [obj2 compare:obj1 options:comparisonOption];
};
return [array sortedArrayUsingComparator:sort];
}

4.查找同一级控件

- (void)uploadData:(UIButton *)btn{
for (UIView *subView in btn.superview.subviews) {
if ([subView isKindOfClass:[UILabel class]]) {
UILabel *label = (UILabel *)subView;
        }
    }
}

5.设备唯一标示

+ (NSString *)udid {
NSString * desStr = [NSString stringWithFormat:@"%@",[[UIDevice currentDevice] identifierForVendor].UUIDString];

return desStr;
}

6.判断字符串是否有中文

+(BOOL)IsChinese:(NSString *)str {
for(int i=0; i< [str length];i++){
int a = [str characterAtIndex:i];
if( a > 0x4e00 && a < 0x9fff){
return YES;
        }
    } return NO;
}

7.获取随机UUID

- (NSString *)uuid {
    CFUUIDRef puuid = CFUUIDCreate(nil);
    CFStringRef uuidString = CFUUIDCreateString(nil, puuid);
NSString * result = (NSString *)CFBridgingRelease(CFStringCreateCopy(NULL, uuidString));
    CFRelease(puuid);
    CFRelease(uuidString);
return result.lowercaseString;
}
+ (NSString *)uuid {
return [[[self alloc] init] uuid];
}

8.MD5 32位加密

- (NSString *)md532BitUpper:(NSString *)str {
const char * cStr = [str UTF8String];
unsigned char result[16];
NSNumber * num = [NSNumber numberWithUnsignedLong:strlen(cStr)];
    CC_MD5(cStr, [num intValue], result);
NSMutableString * ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH];
for (long i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [ret appendFormat:@"%02x",result[i]];
    }
return ret;
}
+ (NSString *)md532Bitupper:(NSString *)str {
return [[[self alloc] init] md532BitUpper:str];
}

9.IOS通过正则判断6~18位包含数字或字母的字符串

- (BOOL)validateNumber:(NSString *) textString
{
NSString* number=@"^[0-9A-Za-z]{6,18}";
    NSPredicate *numberPre = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",number];
return [numberPre evaluateWithObject:textString];
}