一：NSString转为基本数据类型

int a = [str intValue];

float a = [str floatValue];

BOOL a = [str boolValue];

二：基本数据类型转为NSString

NSNumber转NSString:

NSNumberFormatter* numberFormatter = [[NSNumberFormatteralloc] init];

B = [numberFormatter stringFromNumber:A];

nsstring和float 还有int之间的转换

NSString *tempA = @"123";

NSString *tempB = @"456";

1，字符串拼接

NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB];

2，int转字符

NSString *stringInt = [NSString stringWithFormat:@"%d",intString];

3，float转字符

NSString *stringFloat = [NSString stringWithFormat:@"%f"

三：结构体转字符串

NSStringFromCGPoint(CGPoint point);

NSStringFromCGVector(CGVector vector);

NSStringFromCGSize(CGSize size);

NSStringFromCGRect(CGRect rect);

NSStringFromCGAffineTransform(CGAffineTransform transform);

NSStringFromUIEdgeInsets(UIEdgeInsets insets);

NSStringFromUIOffset(UIOffset offset);

四：字符串转结构体

CGPointFromString(NSString *string);

CGVectorFromString(NSString *string);

CGSizeFromString(NSString *string);

CGRectFromString(NSString *string);

CGAffineTransformFromString(NSString *string);

UIEdgeInsetsFromString(NSString *string);

UIOffsetFromString(NSString *string);

五：基本数据类型转NSNumber

+ (NSNumber *)numberWithChar:(char)value;

+ (NSNumber *)numberWithUnsignedChar:(unsigned char)value;

+ (NSNumber *)numberWithShort:(short)value;

+ (NSNumber *)numberWithUnsignedShort:(unsigned short)value;

+ (NSNumber *)numberWithInt:(int)value;

+ (NSNumber *)numberWithUnsignedInt:(unsigned int)value;

+ (NSNumber *)numberWithLong:(long)value;

+ (NSNumber *)numberWithUnsignedLong:(unsigned long)value;

+ (NSNumber *)numberWithLongLong:(long long)value;

+ (NSNumber *)numberWithUnsignedLongLong:(unsigned long long)value;

+ (NSNumber *)numberWithFloat:(float)value;

+ (NSNumber *)numberWithDouble:(double)value;

+ (NSNumber *)numberWithBool:(BOOL)value;

+ (NSNumber *)numberWithInteger:(NSInteger)value NS_AVAILABLE(10_5, 2_0);

+ (NSNumber *)numberWithUnsignedInteger:(NSUInteger)value NS_AVAILABLE(10_5, 2_0);

六：NSNumber转基本数据类型

@property (readonly) char charValue;

@property (readonly) unsigned char unsignedCharValue;

@property (readonly) short shortValue;

@property (readonly) unsigned short unsignedShortValue;

@property (readonly) int intValue;

@property (readonly) unsigned int unsignedIntValue;

@property (readonly) long longValue;

@property (readonly) unsigned long unsignedLongValue;

@property (readonly) long long longLongValue;

@property (readonly) unsigned long long unsignedLongLongValue;

@property (readonly) float floatValue;

@property (readonly) double doubleValue;

@property (readonly) BOOL boolValue;

@property (readonly) NSInteger integerValue NS_AVAILABLE(10_5, 2_0);

@property (readonly) NSUInteger unsignedIntegerValue NS_AVAILABLE(10_5, 2_0);

@property (readonly, copy) NSString *stringValue;